Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/models/form/admin_settings.rb`:
  New setting added upstream. Ported it.
- `app/views/statuses/_simple_status.html.haml`:
  Upstream removed RTL classes. Did the same.
- `config/settings.yml`:
  New setting added upstream. Ported it.

db/migrate/20200309150742_add_forwarded_to_reports.rb

@@ -0,0 +1,5 @@
+class AddForwardedToReports < ActiveRecord::Migration[5.2]
+  def change
+    add_column :reports, :forwarded, :boolean
+  end
+end

db/migrate/20201206004238_create_instances.rb

@@ -0,0 +1,9 @@
+class CreateInstances < ActiveRecord::Migration[5.2]
+  def change
+    create_view :instances, materialized: true
+
+    # To be able to refresh the view concurrently,
+    # at least one unique index is required
+    safety_assured { add_index :instances, :domain, unique: true }
+  end
+end