Remove activity tab until it is fully implemented

circle/dashboard/templates/dashboard/vm-detail.html

@@ -223,12 +223,14 @@
               <i class="fa fa-globe fa-2x"></i><br>
               {% trans "Network" %}</a>
           </li>
+          <!--
           <li>
             <a href="#activity" data-toggle="pill" data-target="#_activity" class="text-center"
                data-activity-url="{% url "dashboard.views.vm-activity-list" instance.id %}">
               <i class="fa fa-clock-o fa-2x"></i><br>
               {% trans "Activity" %}</a>
           </li>
+          -->
         </ul>
 
         <div class="tab-content panel-body">