Add navigation to intro page

docs/_includes/navigation.html

@@ -34,6 +34,7 @@
   <li class="divider"></li>
 
   <h5>Task cookbook</h5>
+  <!-- Also add to intro/index.markdown  -->
   <li><a href="/documentation/tasks/intro/">Introduction</a></li>
   <li><a href="/documentation/tasks/rails/">Rails related tasks</a></li>
   <li class="divider"></li>

docs/documentation/tasks/intro/index.markdown

@@ -8,3 +8,8 @@ These pages document common custom tasks for specific use cases. It is hoped tha
 You can also look in most Capistrano repositories (including core) for rake tasks to see further example of how it works.
 
 Feel free to contribute more via a Pull Request.
+
+### Pages
+
+<!-- Also add to navigation.html  -->
+* [Rails related tasks](/documentation/tasks/rails/)