make Remark rehype options available in astro config

[gtnbssn]

Changes

• Allows to set remark-rehype options in astro.config.mjs
• See options here https://github.com/remarkjs/remark-rehype#options
• Astro has {allowDangerousHtml: true, passThrough: ["raw", "mdxTextExpression", "mdxJsxTextElement", "mdxJsxFlowElement"]} by default, this keeps them and will extend the values with what goes in the astro.config.mjs
• This should allow to set other options, notably footerLabel to close #3163

Testing

Add this in astro.config.mjs

markdown: {
  remarkRehype: {
    footnoteLabel : "other title for footnotes",
    footnoteBackLabel: 'other text for the link back to content',
  }
}

Create a markdown page with a least one footnote and check that the title for the footnotes section has been updated.

Docs

I'll update (if necessary) and reopen docs#445 if this passes.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2f2271df3e760b92018b4e5ea41f0ad294c8fce3

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

This PR includes changesets to release 15 packages

Name	Type
astro	Minor
@astrojs/markdown-remark	Minor
@e2e/astro-component	Patch
@e2e/error-react-spectrum	Patch
@e2e/error-sass	Patch
@e2e/errors	Patch
@e2e/hydration-race	Patch
@e2e/lit-component	Patch
@e2e/preact-component	Patch
@e2e/react-component	Patch
@e2e/solid-component	Patch
@e2e/solid-recurse	Patch
@e2e/svelte-component	Patch
@e2e/e2e-tailwindcss	Patch
@e2e/ts-resolution	Patch

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[gtnbssn]

@EiffelFly i think this is it! I had to explicitly import the types for handlers and add them back in the RemarkRehype type.

I don't think the failing tests are related to this patch so hopefully this is ok.

[bholmesdev]

Making a note to pull this from the MDX integration! I'll make a separate PR for that when this is merged 👍