feat: upgrade docusaurus to 2.0.0-beta.8.

Author: asaf

package.json

@@ -15,8 +15,8 @@
   },
   "dependencies": {
     "@crossid/docusaurus-remote-content": "^0.1.5",
-    "@docusaurus/core": "^2.0.0-beta.6",
-    "@docusaurus/preset-classic": "^2.0.0-beta.6",
+    "@docusaurus/core": "^2.0.0-beta.8",
+    "@docusaurus/preset-classic": "^2.0.0-beta.8",
     "@mdx-js/react": "^1.6.21",
     "clsx": "^1.1.1",
     "mdx-mermaid": "^1.1.0",