Documentation on SSR support

[MbBrainz]

Is there an existing issue for this?

• I have searched the existing issues

Code of Conduct

• I agree to follow this project's Code of Conduct

Feature Request

It would be great to add some docs on how react-live deals with SSR and how to optimize for it.

[carbonrobot]

React-live will render in an SSR site, but does not support the initial render. There have been a couple attempts at implementing full SSR, but the PRs are not in a mergeable state currently.