Include CSV parser for user-friendly account import
Mark both fields as required on the login page
Remove ability to gain access to setup after it's been done
Show a warning message on the login screen when there are no users
Move leftover functions into a utility class
Move config loading to a dedicated class
Add ability to hide the menu
Redirect to a new account import page if no users exist yet
Added instructions for the account import
Perform the file upload and account import
Add some comments
Only redirect if it's the initial import of users
Remove the now-obsolete import users CLI script