build(devs-dep): update docusaurus deps (#1132)

Author: ahnpnl

website/package.json

@@ -12,10 +12,10 @@
     "clear": "docusaurus clear"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.6",
-    "@docusaurus/plugin-ideal-image": "^2.0.0-beta.6",
-    "@docusaurus/plugin-pwa": "^2.0.0-beta.6",
-    "@docusaurus/preset-classic": "^2.0.0-beta.6",
+    "@docusaurus/core": "^2.0.0-beta.9",
+    "@docusaurus/plugin-ideal-image": "^2.0.0-beta.9",
+    "@docusaurus/plugin-pwa": "^2.0.0-beta.9",
+    "@docusaurus/preset-classic": "^2.0.0-beta.9",
     "@mdx-js/react": "^1.6.21",
     "clsx": "^1.1.1",
     "latest-version": "^6.0.0",