fix(markdown): escape when mode == 'md'

[JuanM04]

Changes

I've recently encountered this error when using mode: 'md':

 error   Transform failed with 1 error:
  /home/juanm04/dev/projects/portfolio/src/pages/docs/wsl-memory.md:34:164: ERROR: Expected "}" but found "distro"
  File:
    /home/juanm04/dev/projects/portfolio/src/pages/docs/wsl-memory.md
  Code:
      33 | Therefore, in your situation, all you need to include in your file is ⤵
      35 | ```ini:.wslconfig
      36 | [wsl2]
      37 | memory=1GB

It turned out, rehypeEscape was only being executed when mode was equal to mdx, so I've made it so it always get executed. (Plus, I've made some formatting so make it more clear what is being used with MDX and what don't)

Testing

Docs

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🦋 Changeset detected

Latest commit: 1b60752

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/markdown-remark	Patch

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[tony-sull]

LGTM! I like the formatting clean up you included here 👍