docs: 🐛 fixe iframe width + bump docusaurus to the latest version

Signed-off-by: jffarge <jeanfrancois.farge@gmail.com>

website/package.json

@@ -18,8 +18,8 @@
     "ci": "start-server-and-test 'yarn start-server' '3000|3001' 'yarn run cypress run'"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.6",
-    "@docusaurus/preset-classic": "^2.0.0-beta.6",
+    "@docusaurus/core": "^2.0.0-beta.9",
+    "@docusaurus/preset-classic": "^2.0.0-beta.9",
     "@mdx-js/react": "^1.6.21",
     "@svgr/webpack": "^5.5.0",
     "amplitude-js": "^8.13.0",
@@ -28,6 +28,7 @@
     "docusaurus2-dotenv": "^1.4.0",
     "file-loader": "^6.2.0",
     "nprogress": "^0.2.0",
+    "querystringify": "^2.2.0",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-social-login-buttons": "^3.6.0",