Show native head panel for logged-in users at public area

app/views/layouts/public.html.haml

@@ -2,15 +2,19 @@
 %html{ lang: "en"}
   = render "layouts/head", title: "Public Projects"
   %body{class: "#{app_theme} application"}
-    %header.navbar.navbar-static-top.navbar-gitlab
-      .navbar-inner
-        .container
-          %div.app_logo
-            %span.separator
-            = link_to root_path, class: "home" do
-              %h1 GITLAB
-            %span.separator
-          %h1.project_name Public Projects
+    - if current_user
+      = render "layouts/head_panel", title: "Public Projects"
+    - else
+      %header.navbar.navbar-static-top.navbar-gitlab
+        .navbar-inner
+          .container
+            %div.app_logo
+              %span.separator
+              = link_to root_path, class: "home" do
+                %h1 GITLAB
+              %span.separator
+            %h1.project_name Public Projects
+
     .container.navless-container
       .content
         = yield