Add preference to hide following/followers lists (#7532)

* Add preference to hide following/followers lists

- Public pages
- ActivityPub collections (does not return pages but does give total)
- REST API (unless it's your own) (does not federate)

Fix #6901

* Add preference

* Add delegation

* Fix issue

* Fix issue

app/views/settings/preferences/show.html.haml

@@ -26,6 +26,9 @@
   .fields-group
     = f.input :setting_noindex, as: :boolean, wrapper: :with_label
 
+  .fields-group
+    = f.input :setting_hide_network, as: :boolean, wrapper: :with_label
+
   %h4= t 'preferences.web'
 
   .fields-group