Bump @mdx-js/react from 1.6.22 to 2.3.0 in /site

Bumps [@mdx-js/react](https://github.com/mdx-js/mdx/tree/HEAD/packages/react) from 1.6.22 to 2.3.0.
- [Release notes](https://github.com/mdx-js/mdx/releases)
- [Changelog](https://github.com/mdx-js/mdx/blob/main/changelog.md)
- [Commits](https://github.com/mdx-js/mdx/commits/2.3.0/packages/react)

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

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

site/package.json

@@ -22,7 +22,7 @@
     "@docusaurus/core": "2.0.1",
     "@docusaurus/plugin-pwa": "^2.0.1",
     "@docusaurus/preset-classic": "2.0.1",
-    "@mdx-js/react": "^1.6.22",
+    "@mdx-js/react": "^2.3.0",
     "@typeform/embed-react": "^1.18.0",
     "algoliasearch": "^4.14.2",
     "clsx": "^1.2.1",