Bump @astrojs/starlight from 0.17.4 to 0.18.0 (#28)

Bumps [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) from 0.17.4 to 0.18.0.
- [Release notes](https://github.com/withastro/starlight/releases)
- [Changelog](https://github.com/withastro/starlight/blob/main/packages/starlight/CHANGELOG.md)
- [Commits](https://github.com/withastro/starlight/commits/@astrojs/[email protected]/packages/starlight)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

website/package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@astrojs/preact": "^3.1.0",
-    "@astrojs/starlight": "^0.17.2",
+    "@astrojs/starlight": "^0.18.0",
     "astro": "^4.2.8",
     "i18n-num-in-words": "workspace:*",
     "preact": "^10.19.3",