Make "Get started with Builds" Help Page link work properly

This is probably a horrible way of fixing this issue, but it does work.
I can’t find much information on linking this deeply with Rails routes.

Resolves #14872.

app/views/projects/_builds_settings.html.haml

@@ -4,7 +4,7 @@
   - unless @repository.gitlab_ci_yml
     .form-group
       %p Builds need to be configured before you can begin using Continuous Integration.
-      = link_to 'Get started with Builds', help_page_path('ci/quick_start', 'README'), class: 'btn btn-info'
+      = link_to 'Get started with Builds', help_page_path('ci', 'quick_start', 'README'), class: 'btn btn-info'
   .form-group
     %p Get recent application code using the following command:
     .radio

config/routes.rb

@@ -91,6 +91,7 @@ Rails.application.routes.draw do
   # Help
   get 'help'                  => 'help#index'
   get 'help/:category/:file'  => 'help#show', as: :help_page, constraints: { category: /.*/, file: /[^\/\.]+/ }
+  get 'help/:category/:subcategory/:file'  => 'help#show', as: :deep_help_page, constraints: { category: /.*/, subcategory: /.*/, file: /[^\/\.]+/ }
   get 'help/shortcuts'
   get 'help/ui' => 'help#ui'