Rewrite Authentication Flow

[RyanJField]

Currently, users on the remote registry are authenticated using GitHub and a MariaDB.

This should be changed to use a single file in a new repo of approved users, to allow people to put in a PR to be added to the approved users.

This file should identify the user by name and identifier (whichever identifier the user uses in the CLI). The identifier should be in the format of the URL e.g., https://orcid.org/0000-0002-4424-9890 or https://github.com/RyanJField/

Related to #304