Update documentation for 'optional' configurations (SSL/TLS & Authentication)

[mc1903]

Hi,

I appreciate Tang does not require SSL/TLS or authentication, but as the README references both as optional, would you be able to provide some guidance/examples for implementing both please?

Is TLS natively supported by Tang or would we just use a reverse proxy?

I would like to remotely (i.e. from the Tang servers) block a single client from authenticating, to prevent it from unlocking automatically on it's next boot. How would this be achieved?

Thanks M