Update _includes/important-links.html

Author: yrashk

_includes/important-links.html

@@ -7,6 +7,6 @@ <h3 class="widget-title">Important Links</h3>
     <li><a class="spec" href="https://github.com/elixir-lang/elixir/issues" target="_blank">Issues Tracker</a></li>
     <li><a class="spec" href="https://github.com/elixir-lang/elixir-tmbundle" target="_blank">Textmate Bundle</a></li>
     <li><a class="spec" href="https://github.com/elixir-lang/vim-elixir" target="_blank">Vim Elixir</a></li>
-    <li><a class="spec" href="crash-course.html">Crash Course for Erlang developers</a></li>
+    <li><a class="spec" href="http://elixir-lang.org/crash-course.html">Crash Course for Erlang developers</a></li>
   </ul>
 </div>