downgrade demo to react 18

Author: harrel56

examples/package.json

@@ -12,16 +12,16 @@
   },
   "dependencies": {
     "prismjs": "1.29.0",
-    "react": "19.0.0",
-    "react-dom": "19.0.0",
+    "react": "18.3.1",
+    "react-dom": "18.3.1",
     "sortablejs": "1.15.6",
     "use-sortablejs": "*"
   },
   "devDependencies": {
     "@babel/preset-env": "7.26.9",
     "@babel/preset-typescript": "7.26.0",
     "@types/jest": "29.5.14",
-    "@types/react": "19.0.10",
+    "@types/react": "18.3.20",
     "@types/react-dom": "19.0.4",
     "@types/sortablejs": "1.15.8",
     "@types/prismjs": "1.26.5",