update renovate config to group all docusaurus pkgs

Signed-off-by: Nick Slowinski <nick@nick-slowinski.de>

renovate.json

@@ -1,3 +1,17 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+  {
+    "packageRules": [
+      {
+        "extends": "monorepo:docusaurus",
+        "groupName": "docusaurus monorepo",
+        "matchUpdateTypes": [
+          "digest",
+          "patch",
+          "minor",
+          "major"
+        ]
+      }
+    ]
+  }
 }