Update dependency docz to v2

Author: renovate-bot

package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "axios": "^0.19.0",
-    "docz": "^1.3.2",
+    "docz": "^2.0.0",
     "docz-theme-default": "^1.2.0",
     "prop-types": "^15.7.2",
     "react-helmet": "^5.2.1"