Added Geo icon to the top right header area linking back to primary node

app/views/layouts/header/_default.html.haml

@@ -30,6 +30,10 @@
                 - unless todos_pending_count == 0
                   %span.badge.todos-pending-count
                     = todos_pending_count
+            - if Gitlab::Geo.secondary?
+              %li
+                = link_to Gitlab::Geo.primary_node.url, title: 'Go to primary node', data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
+                  =icon('globe fw')
             - if current_user.can_create_project?
               %li
                 = link_to new_project_path, title: 'New project', data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do