Change 2FA registration process

[moreirarodrigo]

This issue states the deprecation of devise-authy, i suggest the gem devise-two-factor for it's integration with devise to handle the 2FA process.

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 registration process:
  

• Expected example of future 2FA registration process