diff --git a/layouts/root.html b/layouts/root.html
index 5129b6d..fa95231 100644
--- a/layouts/root.html
+++ b/layouts/root.html
@@ -19,11 +19,11 @@
 		<script>
 			hljs.initHighlightingOnLoad();
 		</script>
-		<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
+		<script src="lib/polyfill.io/v3-es6.js"></script>
 		<script id="MathJax-script" async="true" src="lib/mathjax/es5/tex-mml-chtml.js"></script>
 		<script src="js/lazyload-images.js"></script>
 
-		<script src="https://cdn.jsdelivr.net/npm/lozad/dist/lozad.min.js"></script>
+		<script src="lib/lozad/lozad.min.js"></script>
 		<script>
 			MathJax = {
 				tex: {
diff --git a/lib/lozad/lozad.min.js b/lib/lozad/lozad.min.js
new file mode 100644
index 0000000..7effbca
--- /dev/null
+++ b/lib/lozad/lozad.min.js
@@ -0,0 +1,10 @@
+/*! lozad.js - v1.16.0 - 2020-09-06
+* https://github.com/ApoorvSaxena/lozad.js
+* Copyright (c) 2020 Apoorv Saxena; Licensed MIT */
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.lozad=e()}(this,function(){"use strict";
+/**
+   * Detect IE browser
+   * @const {boolean}
+   * @private
+   */var g="undefined"!=typeof document&&document.documentMode,f={rootMargin:"0px",threshold:0,load:function(t){if("picture"===t.nodeName.toLowerCase()){var e=t.querySelector("img"),r=!1;null===e&&(e=document.createElement("img"),r=!0),g&&t.getAttribute("data-iesrc")&&(e.src=t.getAttribute("data-iesrc")),t.getAttribute("data-alt")&&(e.alt=t.getAttribute("data-alt")),r&&t.append(e)}if("video"===t.nodeName.toLowerCase()&&!t.getAttribute("data-src")&&t.children){for(var a=t.children,o=void 0,i=0;i<=a.length-1;i++)(o=a[i].getAttribute("data-src"))&&(a[i].src=o);t.load()}t.getAttribute("data-poster")&&(t.poster=t.getAttribute("data-poster")),t.getAttribute("data-src")&&(t.src=t.getAttribute("data-src")),t.getAttribute("data-srcset")&&t.setAttribute("srcset",t.getAttribute("data-srcset"));var n=",";if(t.getAttribute("data-background-delimiter")&&(n=t.getAttribute("data-background-delimiter")),t.getAttribute("data-background-image"))t.style.backgroundImage="url('"+t.getAttribute("data-background-image").split(n).join("'),url('")+"')";else if(t.getAttribute("data-background-image-set")){var d=t.getAttribute("data-background-image-set").split(n),u=d[0].substr(0,d[0].indexOf(" "))||d[0];// Substring before ... 1x
+u=-1===u.indexOf("url(")?"url("+u+")":u,1===d.length?t.style.backgroundImage=u:t.setAttribute("style",(t.getAttribute("style")||"")+"background-image: "+u+"; background-image: -webkit-image-set("+d+"); background-image: image-set("+d+")")}t.getAttribute("data-toggle-class")&&t.classList.toggle(t.getAttribute("data-toggle-class"))},loaded:function(){}};function A(t){t.setAttribute("data-loaded",!0)}var m=function(t){return"true"===t.getAttribute("data-loaded")},v=function(t){var e=1<arguments.length&&void 0!==arguments[1]?arguments[1]:document;return t instanceof Element?[t]:t instanceof NodeList?t:e.querySelectorAll(t)};return function(){var r,a,o=0<arguments.length&&void 0!==arguments[0]?arguments[0]:".lozad",t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:{},e=Object.assign({},f,t),i=e.root,n=e.rootMargin,d=e.threshold,u=e.load,g=e.loaded,s=void 0;"undefined"!=typeof window&&window.IntersectionObserver&&(s=new IntersectionObserver((r=u,a=g,function(t,e){t.forEach(function(t){(0<t.intersectionRatio||t.isIntersecting)&&(e.unobserve(t.target),m(t.target)||(r(t.target),A(t.target),a(t.target)))})}),{root:i,rootMargin:n,threshold:d}));for(var c,l=v(o,i),b=0;b<l.length;b++)(c=l[b]).getAttribute("data-placeholder-background")&&(c.style.background=c.getAttribute("data-placeholder-background"));return{observe:function(){for(var t=v(o,i),e=0;e<t.length;e++)m(t[e])||(s?s.observe(t[e]):(u(t[e]),A(t[e]),g(t[e])))},triggerLoad:function(t){m(t)||(u(t),A(t),g(t))},observer:s}}});
diff --git a/lib/polyfill.io/v3-es6.js b/lib/polyfill.io/v3-es6.js
new file mode 100644
index 0000000..e778597
--- /dev/null
+++ b/lib/polyfill.io/v3-es6.js
@@ -0,0 +1,100 @@
+/* Polyfill service v3.110.1
+ * Disable minification (remove `.min` from URL path) for more info */
+
+(function(self, undefined) {function ArrayCreate(r){if(1/r==-Infinity&&(r=0),r>Math.pow(2,32)-1)throw new RangeError("Invalid array length");var n=[];return n.length=r,n}function Call(t,l){var n=arguments.length>2?arguments[2]:[];if(!1===IsCallable(t))throw new TypeError(Object.prototype.toString.call(t)+"is not a function.");return t.apply(l,n)}function Get(n,t){return n[t]}function HasOwnProperty(r,t){return Object.prototype.hasOwnProperty.call(r,t)}function HasProperty(n,r){return r in n}function IsArray(r){return"[object Array]"===Object.prototype.toString.call(r)}function IsCallable(n){return"function"==typeof n}function RequireObjectCoercible(e){if(null===e||e===undefined)throw TypeError(Object.prototype.toString.call(e)+" is not coercible to Object.");return e}function SameValueNonNumber(e,n){return e===n}function ToBoolean(o){return Boolean(o)}function ToNumber(r){return Number(r)}function ToObject(e){if(null===e||e===undefined)throw TypeError();return Object(e)}function 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e=OrdinaryCreateFromConstructor(this,c.prototype,{_values:[],_size:0,_es6Set:!0});r||Object.defineProperty(e,"size",{configurable:!0,enumerable:!1,writable:!0,value:0});var t=arguments.length>0?arguments[0]:undefined;if(null===t||t===undefined)return e;var o=e.add;if(!IsCallable(o))throw new TypeError("Set.prototype.add is not a function");try{for(var n=GetIterator(t);;){var a=IteratorStep(n);if(!1===a)return e;var i=IteratorValue(a);try{o.call(e,i)}catch(y){return IteratorClose(n,y)}}}catch(y){if(!Array.isArray(t)&&"[object Arguments]"!==Object.prototype.toString.call(t)&&!t.callee)throw y;var l,p=t.length;for(l=0;l<p;l++)o.call(e,t[l])}return e};Object.defineProperty(n,"prototype",{configurable:!1,enumerable:!1,writable:!1,value:{}}),r?Object.defineProperty(n,Symbol.species,{configurable:!0,enumerable:!1,get:function(){return this},set:undefined}):CreateMethodProperty(n,Symbol.species,n),CreateMethodProperty(n.prototype,"add",function p(e){var t=this;if("object"!=typeof t)throw new 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r=arguments[1];for(var n=t._values,a=0;a<n.length;a++){var i=n[a];i!==o&&e.call(r,i,i,t)}return undefined}),CreateMethodProperty(n.prototype,"has",function d(e){var t=this;if("object"!=typeof t)throw new TypeError("Method Set.prototype.forEach called on incompatible receiver "+Object.prototype.toString.call(t));if(!0!==t._es6Set)throw new TypeError("Method Set.prototype.forEach called on incompatible receiver "+Object.prototype.toString.call(t));for(var r=t._values,n=0;n<r.length;n++){var a=r[n];if(a!==o&&SameValueZero(a,e))return!0}return!1});var a=function h(){return t(this,"value")};CreateMethodProperty(n.prototype,"values",a),CreateMethodProperty(n.prototype,"keys",a),r&&Object.defineProperty(n.prototype,"size",{configurable:!0,enumerable:!1,get:function(){var e=this;if("object"!=typeof e)throw new TypeError("Method Set.prototype.size called on incompatible receiver "+Object.prototype.toString.call(e));if(!0!==e._es6Set)throw new TypeError("Method Set.prototype.size called on incompatible receiver "+Object.prototype.toString.call(e));for(var t=e._values,r=0,n=0;n<t.length;n++){t[n]!==o&&(r+=1)}return r},set:undefined}),CreateMethodProperty(n.prototype,Symbol.iterator,a),"name"in n||Object.defineProperty(n,"name",{configurable:!0,enumerable:!1,writable:!1,value:"Set"});var i={};Object.defineProperty(i,"isSetIterator",{configurable:!1,enumerable:!1,writable:!1,value:!0}),CreateMethodProperty(i,"next",function b(){var e=this;if("object"!=typeof e)throw new TypeError("Method %SetIteratorPrototype%.next called on incompatible receiver "+Object.prototype.toString.call(e));if(!e.isSetIterator)throw new TypeError("Method %SetIteratorPrototype%.next called on incompatible receiver "+Object.prototype.toString.call(e));var t=e["[[IteratedSet]]"],r=e["[[SetNextIndex]]"],n=e["[[SetIterationKind]]"];if(t===undefined)return CreateIterResultObject(undefined,!0);if(!t._es6Set)throw new Error(Object.prototype.toString.call(t)+" does not have [[SetData]] internal 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+)) {Object.defineProperty(Symbol,"split",{value:Symbol("split")});}if (!("Symbol"in self&&"toPrimitive"in self.Symbol
+)) {Object.defineProperty(Symbol,"toPrimitive",{value:Symbol("toPrimitive")});}if (!("Symbol"in self&&"toStringTag"in self.Symbol
+)) {Object.defineProperty(Symbol,"toStringTag",{value:Symbol("toStringTag")});}var Iterator=function(){var e=function(){return this.length=0,this},t=function(e){if("function"!=typeof e)throw new TypeError(e+" is not a function");return e},_=function(e,n){if(!(this instanceof _))return new _(e,n);Object.defineProperties(this,{__list__:{writable:!0,value:e},__context__:{writable:!0,value:n},__nextIndex__:{writable:!0,value:0}}),n&&(t(n.on),n.on("_add",this._onAdd.bind(this)),n.on("_delete",this._onDelete.bind(this)),n.on("_clear",this._onClear.bind(this)))};return Object.defineProperties(_.prototype,Object.assign({constructor:{value:_,configurable:!0,enumerable:!1,writable:!0},_next:{value:function(){var e;if(this.__list__)return this.__redo__&&(e=this.__redo__.shift())!==undefined?e:this.__nextIndex__<this.__list__.length?this.__nextIndex__++:void this._unBind()},configurable:!0,enumerable:!1,writable:!0},next:{value:function(){return this._createResult(this._next())},configurable:!0,enumerable:!1,writable:!0},_createResult:{value:function(e){return e===undefined?{done:!0,value:undefined}:{done:!1,value:this._resolve(e)}},configurable:!0,enumerable:!1,writable:!0},_resolve:{value:function(e){return this.__list__[e]},configurable:!0,enumerable:!1,writable:!0},_unBind:{value:function(){this.__list__=null,delete this.__redo__,this.__context__&&(this.__context__.off("_add",this._onAdd.bind(this)),this.__context__.off("_delete",this._onDelete.bind(this)),this.__context__.off("_clear",this._onClear.bind(this)),this.__context__=null)},configurable:!0,enumerable:!1,writable:!0},toString:{value:function(){return"[object Iterator]"},configurable:!0,enumerable:!1,writable:!0}},{_onAdd:{value:function(e){if(!(e>=this.__nextIndex__)){if(++this.__nextIndex__,!this.__redo__)return void Object.defineProperty(this,"__redo__",{value:[e],configurable:!0,enumerable:!1,writable:!1});this.__redo__.forEach(function(t,_){t>=e&&(this.__redo__[_]=++t)},this),this.__redo__.push(e)}},configurable:!0,enumerable:!1,writable:!0},_onDelete:{value:function(e){var t;e>=this.__nextIndex__||(--this.__nextIndex__,this.__redo__&&(t=this.__redo__.indexOf(e),-1!==t&&this.__redo__.splice(t,1),this.__redo__.forEach(function(t,_){t>e&&(this.__redo__[_]=--t)},this)))},configurable:!0,enumerable:!1,writable:!0},_onClear:{value:function(){this.__redo__&&e.call(this.__redo__),this.__nextIndex__=0},configurable:!0,enumerable:!1,writable:!0}})),Object.defineProperty(_.prototype,Symbol.iterator,{value:function(){return this},configurable:!0,enumerable:!1,writable:!0}),Object.defineProperty(_.prototype,Symbol.toStringTag,{value:"Iterator",configurable:!1,enumerable:!1,writable:!0}),_}();var ArrayIterator=function(){var e=function(t,r){if(!(this instanceof e))return new e(t,r);Iterator.call(this,t),r=r?String.prototype.includes.call(r,"key+value")?"key+value":String.prototype.includes.call(r,"key")?"key":"value":"value",Object.defineProperty(this,"__kind__",{value:r,configurable:!1,enumerable:!1,writable:!1})};return Object.setPrototypeOf&&Object.setPrototypeOf(e,Iterator.prototype),e.prototype=Object.create(Iterator.prototype,{constructor:{value:e,configurable:!0,enumerable:!1,writable:!0},_resolve:{value:function(e){return"value"===this.__kind__?this.__list__[e]:"key+value"===this.__kind__?[e,this.__list__[e]]:e},configurable:!0,enumerable:!1,writable:!0},toString:{value:function(){return"[object Array Iterator]"},configurable:!0,enumerable:!1,writable:!0}}),e}();if (!("Symbol"in self&&"iterator"in self.Symbol&&!!Array.prototype.entries
+)) {CreateMethodProperty(Array.prototype,"entries",function r(){var r=ToObject(this);return new ArrayIterator(r,"key+value")});}if (!("Symbol"in self&&"iterator"in self.Symbol&&!!Array.prototype.keys
+)) {CreateMethodProperty(Array.prototype,"keys",function r(){var r=ToObject(this);return new ArrayIterator(r,"key")});}if (!("values"in Array.prototype
+)) {"Symbol"in self&&"iterator"in Symbol&&"function"==typeof Array.prototype[Symbol.iterator]?CreateMethodProperty(Array.prototype,"values",Array.prototype[Symbol.iterator]):CreateMethodProperty(Array.prototype,"values",function r(){var r=ToObject(this);return new ArrayIterator(r,"value")});}if (!("Symbol"in self&&"iterator"in self.Symbol&&!!Array.prototype[self.Symbol.iterator]
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