move document classes to extra

slides/chapter-03.en.md

@@ -46,16 +46,9 @@ Document class
 For example:
 
 ``` {.lang-tex .hljs}
-\documentclass[10pt,a5paper,landscape]{scrartcl}
+\documentclass[10pt,a5paper,landscape]{article}
 ```
 
-<ul class="fragment">
-<li>**`scrartcl`, `article`** for short documents</li>
-<li>**`scrreprt`, `report`** for longer documents</li>
-<li>**`scrbook`, `book`** for books</li>
-<li>**`beamer`** for presentations</li>
-</ul>
-
 
 @slide(layout=content-only)
 
@@ -310,6 +303,25 @@ Structure your document and text
 * Add a **table of contents** to your document.
 
 
+@slide(layout=extra-wide-content)
+
+@title
+Document classes
+
+@content
+* There are also other document classes than `article`.
+* Based on the document class, the layout of the generated pdf file changes.
+* Normally speled classes adhere to American English layout norms.
+* **`src`** document classes usually adhere to European layout norms.
+
+Following document classes are available:
+
+* **`scrartcl`, `article`** for short documents
+* **`scrreprt`, `report`** for longer documents
+* **`scrbook`, `book`** for books
+* **`beamer`** for presentations
+
+
 @slide(layout=extra-wide-content)
 
 @title