Upgrade docusaurus version

Author: ohsayan

package.json

@@ -12,8 +12,8 @@
     "clear": "docusaurus clear"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.0",
-    "@docusaurus/preset-classic": "^2.0.0-beta.0",
+    "@docusaurus/core": "^2.0.0-beta.2",
+    "@docusaurus/preset-classic": "^2.0.0-beta.2",
     "@mdx-js/react": "^1.6.21",
     "clsx": "^1.1.1",
     "docusaurus-plugin-auto-sidebars": "^1.0.7",