Fix SSR regression

[jpdriver]

• versions prior to 2.3.0 supported SSR
• we inadvertently lost this functionality in https://github.com/FormidableLabs/react-live/pull/226
• see also https://github.com/FormidableLabs/react-live/issues/272#issuecomment-1022716148

we need to refactor <LiveProvider /> to avoid relying on useEffect (which does not run on the server because it only runs after each render)

we also have a useState hook that gets initialized with empty values. The refactor should make transpileAsync() callable in both the useEffect hook and the useState initializer.

[tujoworker]

Thanks for reporting. I'll come with an PR.

[tujoworker]

@jpdriver and @rilakumma Are you able to look at the PR?