Add 2-factor authentication

[Nonononoki]

Not a priority since Google and FB OAuth already have that feature

[STPKITT]

Can Alovoa be used without having a Facebook or Google account then?

[Nonononoki]

@STPKITT Yes, but there's no 2FA when logging in with an email address for now

[STPKITT]

Allright, thanks very much! If there will be another way of 2FA added to Alovoa I'd prefer that method, of which I don't know the name, in which you can use something like the app "Aegis".

[EchedelleLR]

An option could be setting up privacyIDEA against the userstore DB and performing MFA via de privacyIDEA API.

[ip6li]

2FA is easy to implement if using Keycloak as auth backend for Alovoa.

[Nonononoki]

Closed because of #314