Remove devise-authy and change 2FA registration process

[moreirarodrigo]

The gem devise-authy is deprecated it should be replaced by a more updated gem like devise-two-factor

Currently, to enable 2FA it is expected a country and a phone number, instead it should only show the QR code and the OTP code to be scaned/copied to an authenticator app, also after the registration it should show (and allow to copy to the clipboard) backup codes

(the current 2FA process registration)