example: improve examples, add knex + alasql example

Author: armand1m

example/package-lock.json

@@ -8,7 +8,9 @@
   },
   "dependencies": {
     "@wooorm/starry-night": "^3.9.0",
+    "alasql": "^4.17.2",
     "hast-util-to-jsx-runtime": "^2.3.6",
+    "knex": "^3.2.9",
     "react": "^19.1.0",
     "react-dom": "^19.1.0"
   },
@@ -17,6 +19,7 @@
     "@types/react-dom": "^19.1.2",
     "@vitejs/plugin-react": "^4.3.4",
     "typescript": "^5.8.3",
-    "vite": "^6.2.4"
+    "vite": "^6.2.4",
+    "vite-plugin-node-polyfills": "^0.26.0"
   }
 }