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

Conflicts:
- `README.md`:
  Our README is completely different. Discarded upstream changes.
- `app/javascript/packs/mailer.js`:
  We had removed the file. Move the changes to `app/javascript/core/mailer.js`.

spec/helpers/application_helper_spec.rb

@@ -59,13 +59,6 @@ describe ApplicationHelper do
     end
   end
 
-  describe 'favicon_path' do
-    it 'returns /favicon.ico on production environment' do
-      expect(Rails.env).to receive(:production?).and_return(true)
-      expect(helper.favicon_path).to eq '/favicon.ico'
-    end
-  end
-
   describe 'open_registrations?' do
     it 'returns true when open for registrations' do
       without_partial_double_verification do