Removed unused demo code

demo/package.json

@@ -6,9 +6,6 @@
     "@fortawesome/fontawesome-svg-core": "^6.6.0",
     "@fortawesome/free-brands-svg-icons": "^6.6.0",
     "@fortawesome/react-fontawesome": "^0.2.2",
-    "@testing-library/jest-dom": "^6.5.0",
-    "@testing-library/react": "^16.0.1",
-    "@testing-library/user-event": "^14.5.2",
     "@tippyjs/react": "^4.2.6",
     "@types/jest": "^29.5.13",
     "@types/node": "^22.5.4",
@@ -26,8 +23,7 @@
     "react-router-dom": "^6.26.2",
     "react-scripts": "5.0.1",
     "react-syntax-highlighter": "^15.5.0",
-    "typescript": "^5.6.2",
-    "web-vitals": "^4.2.3"
+    "typescript": "^5.6.2"
   },
   "scripts": {
     "start": "react-scripts start",
@@ -56,6 +52,7 @@
   },
   "devDependencies": {
     "@types/react-syntax-highlighter": "^15.5.13",
-    "gh-pages": "^6.1.1"
+    "gh-pages": "^6.1.1",
+    "@babel/plugin-proposal-private-property-in-object": "^7.21.0"
   }
 }

demo/src/index.tsx

@@ -5,7 +5,6 @@ import App from "./App";
 import { Performance } from "./Performance";
 import { DraftPerf } from "./DraftPerf";
 import { QuillPerf } from "./QuillPerf";
-import reportWebVitals from "./reportWebVitals";
 import "./App.css"
 
 const root = ReactDOM.createRoot(
@@ -36,8 +35,3 @@ root.render(
     <RouterProvider router={router} />
   </React.StrictMode>
 );
-
-// If you want to start measuring performance in your app, pass a function
-// to log results (for example: reportWebVitals(console.log))
-// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
-reportWebVitals();