Merge commit '34cd7d6585992c03298c175ab5d22ad059b58cdb' into glitch-soc/merge-upstream

Conflicts:
- `CONTRIBUTING.md`:
  Upstream changed the file, while we had a different one.
  Updated the common parts.
- `README.md`:
  Upstream changed the file, while we had a different one.
  Updated the common parts.
- `app/helpers/application_helper.rb`:
  Upstream added helpers where glitch-soc had extra ones.
  Added upstream's new helpers.
- `app/models/form/admin_settings.rb`:
  Upstream added some custom handling of one setting, while
  glitch-soc had additional code.
  Ported upstream's code.
- `lib/mastodon/version.rb`:
  Upstream moved some things to `config/mastodon.yml`.
  Did the same.
- `spec/requests/api/v1/accounts/credentials_spec.rb`:
  I don't know honestly.

app/javascript/entrypoints/public.tsx

@@ -119,7 +119,11 @@ function loaded() {
         formattedContent = dateFormat.format(datetime);
       }
 
-      content.title = formattedContent;
+      const timeGiven = content.dateTime.includes('T');
+      content.title = timeGiven
+        ? dateTimeFormat.format(datetime)
+        : dateFormat.format(datetime);
+
       content.textContent = formattedContent;
     });