Add responsive panels to the single-column layout (#10820)

* Add responsive panels to the single-column layout

* Fixes

* Fix not being able to save the preference

* Fix code style issues

* Set max-height on the compose textarea and add a link to relationship manager

config/settings.yml

@@ -31,6 +31,7 @@ defaults: &defaults
   noindex: false
   theme: 'default'
   aggregate_reblogs: true
+  advanced_layout: true
   notification_emails:
     follow: false
     reblog: false