chore: update docusaurus

Author: LonelyCpp

website/package.json

@@ -12,13 +12,13 @@
     "build": "node generateIframe.js;docusaurus build"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-alpha.71",
-    "@docusaurus/preset-classic": "^2.0.0-alpha.71",
+    "@docusaurus/core": "^2.0.0-beta.0",
+    "@docusaurus/preset-classic": "^2.0.0-beta.0",
     "@mdx-js/react": "^1.6.22",
     "clsx": "^1.1.1",
     "html-minifier": "^4.0.0",
-    "react": "^17.0.1",
-    "react-dom": "^17.0.1"
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2"
   },
   "browserslist": {
     "production": [