feat(mdx-loader): add support for siteConfig.markdown.remarkRehypeOptions

[slorber]

Motivation

Makes it possible to provide custom remark-rehype options, documented at https://github.com/remarkjs/remark-rehype#options

Fix #9502

Fix #8743

Test Plan

Unit tests + dogfood

Local test shows it's now possible to translate the footnoteLabel, among other things

Test links

Docs: https://deploy-preview-9674--docusaurus-2.netlify.app/docs/api/docusaurus-config#markdown

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 68	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/installation	🟠 69	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog	🟠 75	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 65	🟢 97	🟢 100	🟢 100	🟠 89	Report
/blog/tags/release	🟠 75	🟢 100	🟢 100	🟠 80	🟠 89	Report
/blog/tags	🟠 76	🟢 100	🟢 100	🟢 90	🟠 89	Report

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Build	Status	Details	Updated (UTC)
default (Inspect)	🧿 Changes detected (Review)	124 changes	Jan 5, 2024, 6:56 PM

[github-actions]

Size Change: +48 B (0%)

Total Size: 926 kB

Filename	Size	Change
website/build/assets/js/main.********.js	716 kB	+48 B (0%)

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	59.2 kB
website/build/assets/css/styles.********.css	114 kB
website/build/index.html	37.6 kB

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