Migrate config renovate.json

renovate.json

@@ -5,7 +5,9 @@
   ],
   "packageRules": [
     {
-      "extends": "monorepo:docusaurus",
+      "extends": [
+        "monorepo:docusaurus"
+      ],
       "groupName": "docusaurus monorepo",
       "matchUpdateTypes": [
         "digest",
@@ -15,7 +17,9 @@
       ]
     }
   ],
-  "reviewers": ["nickslowinski"],
+  "reviewers": [
+    "nickslowinski"
+  ],
   "customManagers": [
     {
       "customType": "regex",