Small tweaks to HTML to JSX page

 - Remove "Compiled JS" tab since it doesn't make sense
 - Relabelled editor to "Live HTML Editor" rather than "Live JSX Editor"
It was, because that was the only use-case (neglecting html-jsx). I'm saying that I don't think we should have a (albeit convenient) default here; rather, `isRequired`, then pass either "Live JSX Editor" or "Live HTML Editor". But this is really insignificant lol. I'll let someone merge this =)