I've removed twitter sign in to Slax website and I've added email sign in. How it works? If you wish to sign in, choose "Sign in with Email" from the available options. You'll be asked for your name and email, fill that in and click Submit.
You will receive a link in email which will sign you in automatically. Next time you will need to visit that link to sign in again, it serves as a password for you. Alternatively, you may request new sign-in link each time you wish to login, it doesn't matter.