Updated icons and removed excessive features.

Ultra OTP now salts and hashes your master password with your username on the client before it is transmitted to the server. Once the server receives the hashed password from your device it is then salted again with a cryptographically secure random value, hashed again and stored in a secure database. This hash value is used for login authentication.

Your master password--which is used to encrypt/decrypt 2fa token data--will never leave your machine, so even if a server gets compromised your sensitive data will remain safe.

Update token edit API to accommodate new Firestore database.

Update login and registration APIs for firestore db