fix: Use projectSettings for root directory

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

vercel.json

@@ -1,9 +1,5 @@
 {
-  "version": 2,
-  "builds": [
-    {
-      "src": "website/package.json",
-      "use": "@vercel/next"
-    }
-  ]
+  "projectSettings": {
+    "rootDirectory": "website"
+  }
 }