Bump astro from 5.17.3 to 5.18.0 in /docs

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.17.3 to 5.18.0.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/astro@5.18.0/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@5.18.0/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs/package-lock.json

@@ -16,7 +16,7 @@
     "@astrojs/starlight-tailwind": "^4.0.2",
     "@fontsource-variable/plus-jakarta-sans": "^5.2.8",
     "@tailwindcss/vite": "^4.2.1",
-    "astro": "^5.17.3",
+    "astro": "^5.18.0",
     "astro-mermaid": "^1.3.1",
     "sharp": "^0.34.5",
     "starlight-image-zoom": "^0.13.2",