Fix navigation menu

Closes #6.
diff --git a/site/_includes/themes/apache/_navigation.html b/site/_includes/themes/apache/_navigation.html
index 5066841..b038440 100644
--- a/site/_includes/themes/apache/_navigation.html
+++ b/site/_includes/themes/apache/_navigation.html
@@ -14,8 +14,14 @@
         </div>
         <nav class="navbar-collapse collapse" role="navigation">
           <ul class="nav navbar-nav navbar-right">
-            <li><a href="/community.html">Community</a></li>
-            <li><a href="/download.html">Download</a></li>
+            <li id="community">
+              <a href="#" data-toggle="dropdown" class="dropdown-toggle">Community<b class="caret"></b></a>
+               <ul class="dropdown-menu dropdown-left">
+                <li><a href="/community">Get Involved</a></li>
+                <li><a href="/community-members">Who we are</a></li>
+               </ul>
+            </li>
+            <li><a href="{{ site.data.project.source_repository }}">GitHub</a></li>
             <li id="apache">
               <a href="#" data-toggle="dropdown" class="dropdown-toggle">Apache<b class="caret"></b></a>
                <ul class="dropdown-menu">