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/ShippingTaxRate.mdx

@@ -12,7 +12,7 @@ This represents the tax rates applied on a shipping option.
 
 ### constructor
 
-**new ShippingTaxRate**()
+`**new ShippingTaxRate**()`
 
 This represents the tax rates applied on a shipping option.
 
@@ -30,7 +30,7 @@ This represents the tax rates applied on a shipping option.
   },
   {
     "name": "metadata",
-    "type": "Record<`string`, `unknown`\\>",
+    "type": "`Record<string, unknown>`",
     "description": "An optional key-value map with additional details",
     "optional": false,
     "defaultValue": "",
@@ -48,7 +48,7 @@ This represents the tax rates applied on a shipping option.
   },
   {
     "name": "shipping_option",
-    "type": "[`ShippingOption`](ShippingOption.mdx)",
+    "type": "[ShippingOption](ShippingOption.mdx)",
     "description": "The details of the shipping option.",
     "optional": true,
     "defaultValue": "",
@@ -66,7 +66,7 @@ This represents the tax rates applied on a shipping option.
   },
   {
     "name": "tax_rate",
-    "type": "[`TaxRate`](TaxRate.mdx)",
+    "type": "[TaxRate](TaxRate.mdx)",
     "description": "The details of the associated tax rate.",
     "optional": true,
     "defaultValue": "",