Route admin login through main login page #560

Describe the feature you'd like and what it will do

Disable the built-in admin login page and instead route admin logins through the main login page.

Why is this feature important?

The admin login page doesn't have any rate limiting, and it doesn't provide an option for OAuth logins.

Is your feature request related to a problem? Please describe.

No response

Any additional comments?

No response