Don't remove IDs via premailer

This makes it easier to debug style rules.

config/initializers/premailer.rb

@@ -3,6 +3,6 @@ Premailer::Rails.config.merge!(
   generate_text_part: false,
   preserve_styles: true,
   remove_comments: true,
-  remove_ids: true,
+  remove_ids: false,
   remove_scripts: false
 )