Move admin nav to horizontal layout nav

app/views/layouts/admin.html.haml

 - page_title    "Admin Area"
 - header_title  "Admin Area", admin_root_path
-- sidebar       "admin"
+- nav           "admin"
 
 = render template: "layouts/application"

app/views/layouts/nav/_admin.html.haml

-%ul.nav.nav-sidebar
+%ul.nav-links.scrolling-tabs
+  .fade-left
   = nav_link(controller: :dashboard, html_options: {class: 'home'}) do
     = link_to admin_root_path, title: 'Overview' do
-      = icon('dashboard fw')
       %span
         Overview
   = nav_link(controller: [:admin, :projects]) do
     = link_to admin_namespaces_projects_path, title: 'Projects' do
-      = icon('cube fw')
       %span
         Projects
   = nav_link(controller: :users) do
     = link_to admin_users_path, title: 'Users' do
-      = icon('user fw')
       %span
         Users
   = nav_link(controller: :groups) do
     = link_to admin_groups_path, title: 'Groups' do
-      = icon('group fw')
       %span
         Groups
   = nav_link(controller: :deploy_keys) do
     = link_to admin_deploy_keys_path, title: 'Deploy Keys' do
-      = icon('key fw')
       %span
         Deploy Keys
   = nav_link path: ['runners#index', 'runners#show'] do
     = link_to admin_runners_path, title: 'Runners' do
-      = icon('cog fw')
       %span
         Runners
         %span.count= number_with_delimiter(Ci::Runner.count(:all))
   = nav_link path: 'builds#index' do
     = link_to admin_builds_path, title: 'Builds' do
-      = icon('link fw')
       %span
         Builds
         %span.count= number_with_delimiter(Ci::Build.count(:all))
   = nav_link(controller: :logs) do
     = link_to admin_logs_path, title: 'Logs' do
-      = icon('file-text fw')
       %span
         Logs
   = nav_link(controller: :health_check) do
     = link_to admin_health_check_path, title: 'Health Check' do
-      = icon('medkit fw')
       %span
         Health Check
   = nav_link(controller: :broadcast_messages) do
     = link_to admin_broadcast_messages_path, title: 'Messages' do
-      = icon('bullhorn fw')
       %span
         Messages
   = nav_link(controller: :hooks) do
     = link_to admin_hooks_path, title: 'Hooks' do
-      = icon('external-link fw')
       %span
         Hooks
   = nav_link(controller: :background_jobs) do
     = link_to admin_background_jobs_path, title: 'Background Jobs' do
-      = icon('cog fw')
       %span
         Background Jobs
   = nav_link(controller: :appearances) do
     = link_to admin_appearances_path, title: 'Appearances' do
-      = icon('image')
       %span
         Appearance
 
   = nav_link(controller: :applications) do
     = link_to admin_applications_path, title: 'Applications' do
-      = icon('cloud fw')
       %span
         Applications
 
   = nav_link(controller: :services) do
     = link_to admin_application_settings_services_path, title: 'Service Templates' do
-      = icon('copy fw')
       %span
         Service Templates
 
   = nav_link(controller: :labels) do
     = link_to admin_labels_path, title: 'Labels' do
-      = icon('tags fw')
       %span
         Labels
 
   = nav_link(controller: :abuse_reports) do
     = link_to admin_abuse_reports_path, title: "Abuse Reports" do
-      = icon('exclamation-circle fw')
       %span
         Abuse Reports
         %span.count= number_with_delimiter(AbuseReport.count(:all))
@@ -95,13 +79,12 @@
   - if askimet_enabled?
     = nav_link(controller: :spam_logs) do
       = link_to admin_spam_logs_path, title: "Spam Logs" do
-        = icon('exclamation-triangle fw')
         %span
           Spam Logs
           %span.count= number_with_delimiter(SpamLog.count(:all))
 
   = nav_link(controller: :application_settings, html_options: { class: 'separate-item'}) do
     = link_to admin_application_settings_path, title: 'Settings' do
-      = icon('cogs fw')
       %span
         Settings
+  .fade-right