move help & communities button out of tag panel

so we can shove the custom tag buttons between them
in the next commit

res/css/structures/_LeftPanel.scss

@@ -33,6 +33,11 @@ limitations under the License.
     flex: 0 0 140px;
 }
 
+.mx_LeftPanel_tagPanelContainer {
+    flex: 0 0 70px;
+    height: 100%;
+}
+
 .mx_LeftPanel_hideButton {
     position: absolute;
     top: 10px;