[docs] Update dependencies

Author: cmfcmf

docs/package.json

@@ -11,8 +11,8 @@
   },
   "dependencies": {
     "@cmfcmf/docusaurus-search-local": "https://github.com/cmfcmf/docusaurus-search-local",
-    "@docusaurus/core": "^2.0.0-alpha.66",
-    "@docusaurus/preset-classic": "^2.0.0-alpha.66",
+    "@docusaurus/core": "^2.0.0-alpha.70",
+    "@docusaurus/preset-classic": "^2.0.0-alpha.70",
     "clsx": "^1.1.1",
     "react": "^17.0.1",
     "react-dom": "^17.0.1"