docs: update docusaurus to v3 (#5625)

* update dependencies

* update onboarding mdx

* fixes for mdx issues

* fixes for mdx compatibility

* resolve mdx errors

* fixes in reference

* fix check errors

* revert change in vale action

* fix node version in action

* fix summary in markdown

www/apps/docs/content/references/services/classes/CustomerGroupUpdate.mdx

@@ -10,14 +10,14 @@ import ParameterTypes from "@site/src/components/ParameterTypes"
 
 ### constructor
 
-**new CustomerGroupUpdate**()
+`**new CustomerGroupUpdate**()`
 
 ## Properties
 
 <ParameterTypes parameters={[
   {
     "name": "metadata",
-    "type": "Record<`string`, `unknown`\\>",
+    "type": "`Record<string, unknown>`",
     "description": "",
     "optional": true,
     "defaultValue": "",