fix: add @types/node to docs devDependencies

Author: ericallam

docs/package.json

@@ -18,6 +18,7 @@
   },
   "devDependencies": {
     "@types/mdx": "^2.0.0",
+    "@types/node": "^22.0.0",
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "typescript": "^5.7.0"