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/SalesChannelLocation.mdx

@@ -12,7 +12,7 @@ This represents the association between a sales channel and a stock locations.
 
 ### constructor
 
-**new SalesChannelLocation**()
+`**new SalesChannelLocation**()`
 
 This represents the association between a sales channel and a stock locations.
 
@@ -57,7 +57,7 @@ This represents the association between a sales channel and a stock locations.
   },
   {
     "name": "sales_channel",
-    "type": "[`SalesChannel`](SalesChannel.mdx)",
+    "type": "[SalesChannel](SalesChannel.mdx)",
     "description": "The details of the sales channel the location is associated with.",
     "optional": false,
     "defaultValue": "",
@@ -88,7 +88,7 @@ This represents the association between a sales channel and a stock locations.
 
 ### beforeInsert
 
-`Private` **beforeInsert**(): `void`
+`Private **beforeInsert**(): void`
 
 #### Returns