Support U2F for Biscuit browser

Biscuit is a browser where you can organize your apps. Very useful if you are buried with tabs! And one of the more useful apps is… Bitwarden :slight_smile: Alas, for the moment, the U2F identification is not supported for Biscuit, and we have to use the Google Authenticator.
Please, support U2F for Biscuit! https://eatbiscuit.com/