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

Conflicts:
- `app/models/account.rb`:
  Not a real conflict, just upstream getting rid of unused constants too close
  to glitch-soc-specific contents.
  Removed unused constants like upstream did.
- `app/models/trends.rb`:
  Conflict because glitch-soc disabled email notifications for trending links.
  Upstream has refactored this quite a bit and added trending posts.
  Took upstream code, but disabling the extra trending stuff will come in
  another commit.
- `app/views/admin/trends/links/index.html.haml`:
  Conflict due to glitch-soc's theming system.
  Ported upstream changes accordingly.

db/migrate/20220202200743_add_trendable_to_accounts.rb

@@ -0,0 +1,7 @@
+class AddTrendableToAccounts < ActiveRecord::Migration[6.1]
+  def change
+    add_column :accounts, :trendable, :boolean
+    add_column :accounts, :reviewed_at, :datetime
+    add_column :accounts, :requested_review_at, :datetime
+  end
+end

db/migrate/20220202200926_add_trendable_to_statuses.rb

@@ -0,0 +1,5 @@
+class AddTrendableToStatuses < ActiveRecord::Migration[6.1]
+  def change
+    add_column :statuses, :trendable, :boolean
+  end
+end

db/migrate/20220224010024_add_ips_to_email_domain_blocks.rb

@@ -0,0 +1,6 @@
+class AddIpsToEmailDomainBlocks < ActiveRecord::Migration[6.1]
+  def change
+    add_column :email_domain_blocks, :ips, :inet, array: true
+    add_column :email_domain_blocks, :last_refresh_at, :datetime
+  end
+end