Remove usage of Django admin interface

[nijel]

Is your feature request related to a problem? Please describe.
Having both Django admin inteface and Weblate itself is confusing and using generic Django admin interface leads to several problems.

Describe the solution you'd like
All should be handled directly in Weblate.

Describe alternatives you've considered
More customization of Django admin could achieve better behavior, but still some things are hard to address (see https://code.djangoproject.com/ticket/10919).

Additional context
Things currently done only in the Django admin, but should be possible from Weblate:

• Performance report
• Repositories status
• SSH keys management (replaced by Handle ssh keys for new private repos #2459)
• Global user and group management, automatic group assignments (related to Invite email for admin generated user accounts #2246 and Return "Edit user" privilege back in a better way #2493 and Manage group members direct from a group modification page #2126 and Create Group Administration Permissions #2127)
• Whiteboard
• Component lists (see Option to add component to component lists [from component page or search results] #1370 and assigning component lists to teams #11549 and Adding/editing the list of components in the weblate interface. #7181)
• Deletion (see Add support for removing components and projects #2221)
• Adding languages (see Creating new language with plural in Frontend #2491)

New features in the interface:

• Sending test mail (see Introduce a simple "send test email" function to validate SMTP settings #2517)

Things which might stay relying on Django Admin forever:

• Audit logs
• Social auth details
• Billing management

[reloxx13]

i cannot see deleted/disabled users in weblate ui are not shown which i see in the admin interface.
i would also prefer a cleaner user list like the table in djangi admin ui and not so blown up.

[nijel]

As you can see, this issue is still in progress...