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

- `.env.production.sample`:
  Our sample config file is very different from upstream since it is much more
  complete. Upstream added documentation for a few env variables.
  Copied the new variables/documentation from upstream.
- `app/lib/feed_manager.rb`:
  Upstream added a timeline type (hashtags), while glitch-soc already had an
  extra one (direct messages). Not really a conflict but textually close
  changes.
  Ported upstream's changes.
- `app/models/custom_emoji.rb`:
  Upstream upped the custom emoji size limit, while glitch-soc had configurable
  limits.
  Upped the default limits accordingly.
- `streaming/index.js`:
  Upstream reworked how hastags were normalized. Minor conflict due to
  glitch-soc's handling of instance-local posts.
  Ported upstream's changes.

app/javascript/mastodon/locales/en.json

@@ -473,6 +473,7 @@
   "status.embed": "Embed",
   "status.favourite": "Favourite",
   "status.filtered": "Filtered",
+  "status.hide": "Hide toot",
   "status.history.created": "{name} created {date}",
   "status.history.edited": "{name} edited {date}",
   "status.load_more": "Load more",
@@ -496,6 +497,7 @@
   "status.report": "Report @{name}",
   "status.sensitive_warning": "Sensitive content",
   "status.share": "Share",
+  "status.show_filter_reason": "Show anyway",
   "status.show_less": "Show less",
   "status.show_less_all": "Show less for all",
   "status.show_more": "Show more",