Ability to use Organizr as Access List / authentication provider

[cmer]

See https://github.com/causefx/Organizr/wiki/Authentication for implementation details.

[scottluker]

Would love to see this as well, just as an update the wiki page has moved to:
https://docs.organizr.app/books/setup-features/page/serverauth

[zhdenny]

I would also love to see this too......I banged my head trying to add this using the custom configuration options provided in nginx-proxy-manager...but couldn't get it to work

[chaptergy]

Closing in favor of #437