Merge branch 'remove-sidebar-help-link' into 'master'

Removed help link from sidebar

Closes #1349

I don't see the point in having two links on the page that will do the same thing.

See merge request !483

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

@@ -31,8 +31,3 @@
       %span
         Merge Requests
         %span.count= current_user.assigned_merge_requests.opened.count
-  = nav_link(controller: :help) do
-    = link_to help_path, title: 'Help' do
-      %i.fa.fa-question-circle
-      %span
-        Help