Adds clusters to the navigation bar

Adds new line at the end of files

app/views/layouts/nav/sidebar/_project.html.haml

@@ -146,7 +146,7 @@
                   = number_with_delimiter(@project.open_merge_requests_count)
 
       - if project_nav_tab? :pipelines
-        = nav_link(controller: [:pipelines, :builds, :jobs, :pipeline_schedules, :environments, :artifacts]) do
+        = nav_link(controller: [:pipelines, :builds, :jobs, :pipeline_schedules, :environments, :artifacts, :clusters]) do
           = link_to project_pipelines_path(@project), class: 'shortcuts-pipelines' do
             .nav-icon-container
               = sprite_icon('pipeline')
@@ -189,6 +189,12 @@
                   %span
                     Charts
 
+            -# - if project_nav_tab? :clusters TODO @shinya @ayufan
+            = nav_link(controller: :clusters) do
+              = link_to project_clusters_path(@project), title: 'Clusters', class: 'shortcuts-clusters' do
+                %span
+                  Clusters
+
       - if project_nav_tab? :wiki
         = nav_link(controller: :wikis) do
           = link_to get_project_wiki_path(@project), class: 'shortcuts-wiki' do