Improve blocked view of profiles (#10491)

* Revert "Fix filtering of favourited_by, reblogged_by, followers and following (#10447)"

This reverts commit 120544067f.

* Revert "Hide blocking accounts from blocked users (#10442)"

This reverts commit 62bafa20a1.

* Improve blocked view of profiles

- Change "You are blocked" to "Profile unavailable"
- Hide following/followers in API when blocked
- Disable follow button and show "Profile unavailable" on public profile as well

app/views/accounts/show.html.haml

@@ -33,7 +33,9 @@
         = active_link_to t('accounts.posts_with_replies'), short_account_with_replies_url(@account)
         = active_link_to t('accounts.media'), short_account_media_url(@account)
 
-      - if @statuses.empty?
+      - if user_signed_in? && @account.blocking?(current_account)
+        .nothing-here.nothing-here--under-tabs= t('accounts.unavailable')
+      - elsif @statuses.empty?
         = nothing_here 'nothing-here--under-tabs'
       - else
         .activity-stream