* Remove checkmark for official plugins
* Add author for plugin, which is By Discourse for all discourse
and discourse-org github plugins
* Link to meta topic instead of github repo
* Add experimental flag for plugin metadata and show this as a
badge on the plugin list if present
---------
Co-authored-by: chapoi <101828855+chapoi@users.noreply.github.com>
Using SiteSetting.queue_jobs= to configure job asynchronicity was deprecated here four years ago and marked for removal in version 2.9.0. This PR removes the fallback method we kept since then. The method was there because it was still being used in a bunch of plugin tests (now fixed.)
