Generate API docs for Toolpad Core

[apedroferreira]

Generate API docs for Toolpad Core - first the proptypes must be generated with pnpm proptypes and then API docs built with pnpm docs:build:api.

Restructured the documentation a bit kind of just to be more like the other MUI libraries I was taking the scripts from and what these scripts expect, but it's all for discussion of course!

API links from component pages are broken - if this PR looks good I think we can fix it here in the MUI monorepo: https://github.com/mui/material-ui/blob/next/packages/markdown/prepareMarkdown.js

API Page: https://deploy-preview-3536--mui-toolpad-docs.netlify.app/toolpad/core/api/app-provider/

[apedroferreira]

This should be good when the PRs this is based on are merged.

I also think we're gonna have to change this in the MUI monorepo to fix API URLs in component pages: https://github.com/mui/material-ui/blob/next/packages/markdown/prepareMarkdown.js But waiting for further review first.

[apedroferreira]

TODO:

• [x] Fix proptypes generation
• [x] Do not list demos in callout for every component with API links

[Janpot]

Thanks! I removed an alias as it broke the demo formatter.