add compact grw nav bar

src/client/styles/scss/_on-edit.scss

@@ -25,6 +25,7 @@ body.on-edit {
   }
 
   // hide unnecessary elements
+  .grw-subnav,
   .row.row-alerts,
   .row.page-list,
   .row.page-comments-row,
@@ -71,6 +72,11 @@ body.on-edit {
     }
   }
 
+  // show compact subnav
+  .grw-compact-subnav {
+    display: block !important;
+  }
+
   /*****************
    * Expand Editor
    *****************/

src/server/views/widget/page_tabs.html

@@ -35,6 +35,10 @@
     </a>
   </li>
   {% endif %}
+    <div class="grw-compact-subnav d-none ml-2">
+      <h4 id="revision-path" class="mb-0"></h4>
+      <div id="tag-label"></div>
+    </div>
   {% endif %}
 
   {#