index: Include facebook as help.

Author: espenak

index.html

@@ -118,7 +118,7 @@ <h2>Get involved</h2>
 
             <div class="section">
                 <h2>Help</h2>
-                Contact us via our Question &amp; Answer forum, issue tracker or email.
+                Contact us via Facebook, Question &amp; Answer forum, issue tracker or email.
                 <a href="https://devilry-userdoc.readthedocs.org/en/latest/contact.html">Read more</a>.
             </div>