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

Conflicts:
- `app/controllers/accounts_controller.rb`:
  Upstream change too close to a glitch-soc change related to
  instance-local toots. Merged upstream changes.
- `app/services/fan_out_on_write_service.rb`:
  Minor conflict due to glitch-soc's handling of Direct Messages,
  merged upstream changes.
- `yarn.lock`:
  Not really a conflict, caused by glitch-soc-only dependencies
  being textually too close to updated upstream dependencies.
  Merged upstream changes.

config/webpack/production.js

@@ -87,7 +87,7 @@ module.exports = merge(sharedConfig, {
         '**/*.woff',
       ],
       ServiceWorker: {
-        entry: `imports-loader?ATTACHMENT_HOST=>${encodeURIComponent(JSON.stringify(attachmentHost))}!${encodeURI(path.join(__dirname, '../../app/javascript/mastodon/service_worker/entry.js'))}`,
+        entry: `imports-loader?additionalCode=${encodeURIComponent(`var ATTACHMENT_HOST=${JSON.stringify(attachmentHost)};`)}!${encodeURI(path.join(__dirname, '../../app/javascript/mastodon/service_worker/entry.js'))}`,
         cacheName: 'mastodon',
         output: '../assets/sw.js',
         publicPath: '/sw.js',