Fix SSR regression #321

• versions prior to 2.3.0 supported SSR
• we inadvertently lost this functionality in Move LiveProvider to hooks, fixes #220 #226
• see also SSR not working anymore since 2.3.0 #272 (comment)

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.