website: upgrade react to v18.

example/index.tsx

@@ -1,8 +1,6 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
+import { createRoot } from 'react-dom/client';
 import App from './app/App';
 
-ReactDOM.render(
-  <App />,
-  document.getElementById('root'),
-);
+const container = document.getElementById('root');
+const root = createRoot(container!);
+root.render(<App />);

package.json

@@ -48,21 +48,21 @@
     "monaco-editor": "^0.33.0"
   },
   "devDependencies": {
-    "@types/react": "~17.0.39",
-    "@types/react-dom": "~17.0.13",
-    "@kkt/less-modules": "~7.1.1",
-    "@kkt/raw-modules": "~7.1.0",
-    "@kkt/scope-plugin-options": "~7.1.0",
-    "@uiw/react-markdown-preview": "~4.0.5",
-    "@uiw/react-github-corners": "~1.5.3",
-    "@wcj/dark-mode": "~1.0.12",
-    "code-example": "^3.3.1",
-    "kkt": "~7.1.0",
+    "@types/react": "^18.0.17",
+    "@types/react-dom": "^18.0.6",
+    "@kkt/less-modules": "^7.2.0",
+    "@kkt/raw-modules": "^7.2.0",
+    "@kkt/scope-plugin-options": "^7.2.0",
+    "@uiw/react-markdown-preview": "^4.0.24",
+    "@uiw/react-github-corners": "^1.5.14",
+    "@wcj/dark-mode": "^1.0.15",
+    "code-example": "^3.3.6",
+    "kkt": "^7.2.0",
     "monaco-editor-webpack-plugin": "~7.0.1",
-    "react": "~17.0.2",
-    "react-dom": "~17.0.2",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
     "source-map-explorer": "~2.5.2",
-    "tsbb": "~3.7.2"
+    "tsbb": "^3.7.6"
   },
   "browserslist": {
     "production": [