Move HTML settings to content blocks settings page

- Rename html settings keys
- Show html settings next to content blocks page
- Hide html settings from configuration tab

app/controllers/admin/site_customization/content_blocks_controller.rb

@@ -9,6 +9,8 @@ class Admin::SiteCustomization::ContentBlocksController < Admin::SiteCustomizati
   def index
     @content_blocks = SiteCustomization::ContentBlock.order(:name, :locale)
     @headings_content_blocks = Budget::ContentBlock.all
+    all_settings = Setting.all.group_by { |setting| setting.type }
+    @html_settings = all_settings["html"]
   end
 
   def create