chore(docs): add reference to the blog

Add a reference to the blog at the documentation.

Author: lgalfaso

docs/src/templates/index.html

@@ -155,6 +155,7 @@
                 <i class="icon-comment icon-white"></i> Discuss <b class="caret"></b>
               </a>
               <ul class="dropdown-menu">
+                <li><a href="http://blog.angularjs.org">Blog</a></li>
                 <li><a href="http://groups.google.com/group/angular">Mailing List</a></li>
                 <li><a href="http://webchat.freenode.net/?channels=angularjs&uio=d4">Chat Room</a></li>
                 <li class="divider"></li>