Follow-up to #6124

* Fix follow/unfollow buttons on public profile

- Present non-logged users with web+mastodon:// URLs for remote accounts
- Present logged-in users with appropriate links (authorize_follows and
  remote_unfollows) for remote accounts

* Do not cache rendered cards if user is logged in

* add haml_lint to Gemfile

* add .haml-lint.yml

* fix warnings of haml_lint

* Expose media attachments on reported statuses directly

* Comment out unused bulk report checkbox. Add title to report comment for viewing full comment. Add 'contents' column, with icons and numerical indicators to show the number of referenced statuses and media attachments in the report

* Link account name on authorize_follow card back to account

* Add localisation string for report_contents

* Show new admin accounts card partial on report view. Apply simple_format to report comment so newlines are preserved.

* Add new admin accounts card partial, for display quick useful admin stats (e.g. report history, moderation status).

* Fix localized variable

* Remove trailing whitespace

* Use query methods instead of explicit .blank? checks