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

Conflicts:
- `README.md`:
  Minor upstream change, our README is completely different.
  Kept ours.
- `lib/tasks/assets.rake`:
  glitch-soc has extra code to deal with its theming system,
  upstream changed a line that exists in glitch-soc.
  Applied upstream changes.

app/workers/activitypub/processing_worker.rb

@@ -15,6 +15,6 @@ class ActivityPub::ProcessingWorker
 
     ActivityPub::ProcessCollectionService.new.call(body, actor, override_timestamps: true, delivered_to_account_id: delivered_to_account_id, delivery: true)
   rescue ActiveRecord::RecordInvalid => e
-    Rails.logger.debug "Error processing incoming ActivityPub object: #{e}"
+    Rails.logger.debug { "Error processing incoming ActivityPub object: #{e}" }
   end
 end