List `ADMIN` Users on log-on screen?

[AARON-CLARK]

I'm wondering if we should list the name(s) of any ADMIN users on the login screen. Bascially, if someone is sent this link to the application, but they weren't granted access (a userid) yet, perhaps it would be useful for them to know who to contact with such a request.

I know this could be achieved by querying the credentials.db and including the name(s) in the notes field on run_app() but I think it would be more sophisticated to integrate this in another way? Maybe with a question mark button somewhere?

Also, we currently don't collect email addresses, but maybe we do make that a required field for ADMIN users so that we can link their emails to their names to make these request workflows more streamlined with a simple mailto: solution.

[aclark02-arcus]

related to #712