Feature: 2FA option

[Joooost]

Is your idea related to a problem? Please describe:

Not a problem but security best practice to secure the front end UI with 2FA.

Describe the solution you'd like:

Add a settings to setup and activate 2FA, the setup process should follow the next step;

1. Enable 2FA
2. Show QR code and scan with mobile - also show some backup digits
3. Ask for confirmation of the 6 digit created 2FA code
4. After confirmation 2FA is enabled
5. Challenge user with 2FA after successful login with credentials
6. Backup codes should work as well

Describe alternatives you've considered:

Alternatives by using Docker containers (Traefik, Nginx in combination with Authelia) can be complex to setup. By having a 2FA feature it is way easier to provide an additional security layer.