docs: revise commerce modules overview pages (#10738)

* revise API Key Module overview

* revise auth module

* support ref sidebar items

* remove examples

* revise cart module

* revise currency

* revise customer module

* revise fulfillment module

* revise inventory module

* revise order module

* revise payment

* revise pricing module

* revise product module

* revise promotion module

* revise region module

* revise sales channel module

* revise stock location module

* revise store module

* revise tax module

* revise user module

* lint content + fix snippets

www/apps/resources/app/commerce-modules/customer/extend/page.mdx

@@ -276,9 +276,9 @@ You'll next execute the workflow in the hook handler.
 
 You can now consume the `customersCreated` hook, which is executed in the `createCustomersWorkflow` after the customer is created.
 
-To consume the hook, create the file `src/workflow/hooks/customer-created.ts` with the following content:
+To consume the hook, create the file `src/workflow/hooks/user-created.ts` with the following content:
 
-```ts title="src/workflow/hooks/customer-created.ts" collapsibleLines="1-6" expandButtonLabel="Show Imports"
+```ts title="src/workflow/hooks/user-created.ts" collapsibleLines="1-6" expandButtonLabel="Show Imports"
 import { createCustomersWorkflow } from "@medusajs/medusa/core-flows"
 import { 
   createCustomFromCustomerWorkflow,