chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/resources/references/modules/customer_models/page.mdx

@@ -0,0 +1,28 @@
+---
+displayed_sidebar: customerModelReference
+slug: /references/customer/models
+---
+
+import { TypeList } from "docs-ui"
+
+# Customer Module Data Models Reference
+
+This documentation provides a reference to the data models in the Customer Module
+
+## Relations Overview
+
+```mermaid
+erDiagram
+	Address }|--|{ Customer : customer
+	Customer }|--|{ CustomerGroup : groups
+	CustomerGroupCustomer }|--|{ Customer : customer
+	CustomerGroupCustomer }|--|{ CustomerGroup : customer_group
+
+```
+
+## Classes
+
+- [Address](../../customer_models/classes/customer_models.Address/page.mdx)
+- [CustomerGroupCustomer](../../customer_models/classes/customer_models.CustomerGroupCustomer/page.mdx)
+- [CustomerGroup](../../customer_models/classes/customer_models.CustomerGroup/page.mdx)
+- [Customer](../../customer_models/classes/customer_models.Customer/page.mdx)