Remove duplicate slide.

sections/german/05/05.md

@@ -320,7 +320,7 @@ Zitat.}</code></pre>
         <td><code>\\textasciitilde</code></td>
       </tr>
       <tr>
-        <td>*</td>
+        <td>＊</td>
         <td><code>\\textasteriskcentered</code></td>
         <td>\</td>
         <td><code>\\textbackslash</code></td>

sections/german/06/06.md

@@ -163,16 +163,3 @@ Back to normal.</code></pre>
         <img src="sections/german/06/url-crop.svg">
     </div>
 </div>
-
-
-
----
-
-<div class="layout-only">
-    <div class="layout-content">
-        <h2 data-category="Aufgabe">4. Sonderzeichen einfügen</h2>
-        <ul>
-            <li class="fragment">...</li>
-        </ul>
-    </div>
-</div>