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/interfaces/PriceSetDTO.mdx

@@ -22,7 +22,7 @@ A price set's data.
   },
   {
     "name": "money_amounts",
-    "type": "[`MoneyAmountDTO`](MoneyAmountDTO.mdx)[]",
+    "type": "[MoneyAmountDTO](MoneyAmountDTO.mdx)[]",
     "description": "The prices that belong to this price set.",
     "optional": true,
     "defaultValue": "",
@@ -31,7 +31,7 @@ A price set's data.
   },
   {
     "name": "rule_types",
-    "type": "[`RuleTypeDTO`](RuleTypeDTO.mdx)[]",
+    "type": "[RuleTypeDTO](RuleTypeDTO.mdx)[]",
     "description": "The rule types applied on this price set.",
     "optional": true,
     "defaultValue": "",