Add link to root_path in menu

app/views/layouts/application.html.haml

@@ -8,10 +8,11 @@
     = csrf_meta_tags
   %body
     .pure-g
+      - if current_user
         .pure-u-1
           .pure-menu.pure-menu-horizontal
+            = link_to "Tab", root_path, class: "pure-menu-heading pure-menu-link"
             %ul.pure-menu-list
-            - if current_user
               %li.pure-menu-item
                 = link_to current_user.name.capitalize, current_user, class: "pure-menu-link"
               - if current_user.penning