Fix follow/unfollow buttons on public profile (fixes #7036) (#7040)

* 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

config/routes.rb

@@ -116,6 +116,7 @@ Rails.application.routes.draw do
   get '/media_proxy/:id/(*any)', to: 'media_proxy#show', as: :media_proxy
 
   # Remote follow
+  resource :remote_unfollow, only: [:create]
   resource :authorize_follow, only: [:show, :create]
   resource :share, only: [:show, :create]