Site delete should delete data from other tables #147
Description
When we delete a site, we don't delete it's data from other tables like cron, auth, whitelist, site_meta etc...
Also it should trigger cleanup actions which would regenerate files (auth files, cron files etc...)
It should also purge cache of that site if any.
Things to do on cleanup:
- Delete DB entries
- Remove related files
- Purge Cache