[MDX] Add Prism and Shiki support (#4002)
* deps: add rehype-prism, shiki, rehype-pretty-code
* wip: apply rehype plugins depending on config
* wip: cherry-pick jsx-runtime fix?
* deps: rehype-pretty-code -> shiki-twoslash, add rehype-raw
* wip: add jsx-runtime fix
* feat: get shiki working!
* deps: add @astrojs/prism, prismjs, unist-util-visit
* feat: add prism support
* example: add small syntax highlight demo to with-mdx
* deps: remove rehype-prism
* chore: remove unused async
* chore: add .test.js to all mdx tests
* test: shiki, shikiConfig, prism
* fix: remove "is:raw" from prism output
* docs: add syntax highlighting section
* chore: add changeset
* nit: "Shiki config" -> Shiki config
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
* Revert "wip: add jsx-runtime fix"
This reverts commit 07f4528f44.
* docs: link to integration README from example
Co-authored-by: Nate Moore <nate@astro.build>
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
3b8a744524