Add FIDO2/Yubikey/WebAuthn authentication support

[newbold]

[maique]

Cool! I have a YubiKey arriving right now, slowly, and it’s great to see I’ll be able to use it here as well!

[lxjv]

i agree with this!! ive been a yubikey user for abt 4 months now i thing and security is yes :)

[newbold]

This is prerequisite for #310.

[pawelorzech]

+1 from me then since I'm all on these yubikeys:)

[byemc]

Feel like @newbold should close this as it looks like this is all implemented

[newbold]

@byemc well, the one remaining piece is adding it as 2FA, with or in lieu of an authenticator. Right now the only limited support is with a passkey, so it’s not yet technically complete. 🤓