chore(deps): bump @astrojs/mdx from 2.3.1 to 3.0.0 in /website

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 2.3.1 to 3.0.0.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/mdx@3.0.0/packages/integrations/mdx)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

website/package.json

@@ -20,7 +20,7 @@
         "e2e:headed": "npx playwright test --headed"
     },
     "dependencies": {
-        "@astrojs/mdx": "^2.3.1",
+        "@astrojs/mdx": "^3.0.0",
         "@astrojs/node": "^8.2.5",
         "@emotion/react": "^11.11.4",
         "@headlessui/react": "^1.7.19",