fix(deps): update dependency @astrojs/starlight to v0.30.4

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
   "dependencies": {
     "@astrojs/markdown-remark": "^5.2.0",
     "@astrojs/rss": "^4.0.7",
-    "@astrojs/starlight": "0.29.2",
+    "@astrojs/starlight": "0.30.4",
     "@lorenzo_lewis/starlight-utils": "^0.2.0",
     "@lunariajs/core": "^0.1.1",
     "@lunariajs/starlight": "^0.1.1",