Merge branch 'migrate-externals-to-hugo'

With this topic branch, Hugo renders the external links page correctly.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

content/doc/ext/_index.html

@@ -0,0 +1,21 @@
+---
+section: "documentation"
+subsection: "external-links"
+title: "Git - External Links"
+url: /doc/ext.html
+aliases:
+- /doc/ext/index.html
+---
+
+<div id='main'>
+  <h1>External Links</h1>
+
+  {{< external/tutorials >}}
+
+  {{< external/books >}}
+
+  {{< external/videos >}}
+
+  {{< external/courses >}}
+
+</div>

app/views/doc/_ext_books.erb layouts/shortcodes/external/books.htmlapp/views/doc/_ext_books.erb renamed to layouts/shortcodes/external/books.html

@@ -78,7 +78,7 @@ <h4><a href="https://www.packtpub.com/web-development/learn-git-3-hours-video">L
         <p class='description'>
           Build powerful and effective projects using Git Version Control Systems.
         </p>
-      </li>      
+      </li>
       <li>
         <h4><a href="https://www.python4data.science/en/latest/productive/git/index.html">Git for Data Science</a></h4>
         <p class='description'>
@@ -124,7 +124,7 @@ <h4><a href="https://www.packtpub.com/web-development/git-and-version-control-vi
         <p class='description'>
           Learn the basics of Git and Version Control through detailed and easy to follow steps.
         </p>
-      </li>      
+      </li>
     </ul>
   </div>
 </div>