chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

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

@@ -0,0 +1,23 @@
+---
+displayed_sidebar: regionModelReference
+slug: /references/region/models
+---
+
+import { TypeList } from "docs-ui"
+
+# Region Module Data Models Reference
+
+This documentation provides a reference to the data models in the Region Module
+
+## Relations Overview
+
+```mermaid
+erDiagram
+	Country }|--|{ Region : region
+
+```
+
+## Classes
+
+- [Country](../../region_models/classes/region_models.Country/page.mdx)
+- [Region](../../region_models/classes/region_models.Region/page.mdx)