FIX: repair old admin wsg and ressources for modernized deployment
- ADD: all the generated images are now commited to prevent the need for regeneration at every deployment since those images won't change that much.
- FIX: fix security problems with embedded password in the settings.py and other config related problems preventing prod deployment
- FIX: admin that was not correctly configured
- TEST: add test for admin login page
- TEST: add test for non admin user trying to connect to admin page
- FIX: preliminary repair of the admin (still lacking the exoplanet_admin custom url)