Remove baseUrl from all bases

This option is being deprecated. It has not been needed since TS 4.1.

Right now, it's set in nuxt, remix, and docusaurus (plus a mention in ember).

But, I don't quite know if removing it will have the desired effect, if the associated paths become relative to the wrong place. But, I assume that won't happen, or the current configs don't actually work, since if it were relative to the tsconfig base configs, they would point to the wrong place anyway.