fix: upgrade @astrojs/starlight from 0.28.6 to 0.30.3

Snyk has created this PR to upgrade @astrojs/starlight from 0.28.6 to 0.30.3.

See this package in yarn:
@astrojs/starlight

See this project in Snyk:
https://app.snyk.io/org/data-team-dt/project/ee034aa7-b6ce-4de5-8d0b-dfccab2c739c?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

docs/package.json

@@ -11,7 +11,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/starlight": "^0.28.5",
+    "@astrojs/starlight": "^0.30.3",
     "astro": "^4.16.18",
     "sharp": "^0.33.5"
   },