Refactor header views

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/layouts/_public_head_panel.html.haml

@@ -1,23 +0,0 @@
-%header.navbar.navbar-fixed-top.navbar-gitlab{ class: nav_header_class }
-  .container
-    .header-logo
-      = link_to explore_root_path, class: "home" do
-        = brand_header_logo
-        %h3 GitLab
-    .header-content
-      %h1.title= title
-
-      %button.navbar-toggle{"data-target" => ".navbar-collapse", "data-toggle" => "collapse", type: "button"}
-        %span.sr-only Toggle navigation
-        %i.fa.fa-bars
-
-      - unless current_controller?('sessions')
-        .pull-right.hidden-xs
-          = link_to "Sign in", new_session_path(:user, redirect_to_referer: 'yes'), class: 'btn btn-sign-in btn-new append-right-10'
-
-        .navbar-collapse.collapse
-          %ul.nav.navbar-nav
-            %li.visible-xs
-              = link_to "Sign in", new_session_path(:user, redirect_to_referer: 'yes')
-
-= render 'shared/outdated_browser'

app/views/layouts/application.html.haml

@@ -3,8 +3,8 @@
   = render "layouts/head"
   %body{class: "#{app_theme}", :'data-page' => body_data_page}
     - if current_user
-      = render "layouts/head_panel", title: header_title
+      = render "layouts/header/default", title: header_title
     - else
-      = render "layouts/public_head_panel", title: header_title
+      = render "layouts/header/public", title: header_title
 
     = render 'layouts/page', sidebar: sidebar

app/views/layouts/devise.html.haml

@@ -2,7 +2,7 @@
 %html{ lang: "en"}
   = render "layouts/head"
   %body.ui_mars.login-page.application
-    = render "layouts/empty_head_panel"
+    = render "layouts/header/empty"
     = render "layouts/broadcast"
     .container.navless-container
       .content

app/views/layouts/errors.html.haml

@@ -2,7 +2,7 @@
 %html{ lang: "en"}
   = render "layouts/head"
   %body{class: "#{app_theme}  application"}
-    = render "layouts/empty_head_panel"
+    = render "layouts/header/empty"
     .container.navless-container
       = render "layouts/flash"
       .error-page

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

@@ -0,0 +1,14 @@
+%header.navbar.navbar-fixed-top.navbar-gitlab{ class: nav_header_class }
+  .container
+    .header-logo
+      = link_to explore_root_path, class: "home" do
+        = brand_header_logo
+        %h3 GitLab
+    .header-content
+      %h1.title= title
+
+      - unless current_controller?('sessions')
+        .pull-right
+          = link_to "Sign in", new_session_path(:user, redirect_to_referer: 'yes'), class: 'btn btn-sign-in btn-success btn-sm'
+
+= render 'shared/outdated_browser'