chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/resources/app/commerce-modules/currency/examples/page.mdx

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+import { CodeTabs, CodeTab } from "docs-ui"
+
+export const metadata = {
+  title: `Examples of the Currency Module`,
+}
+
+# {metadata.title}
+
+In this guide, you’ll find common examples of how you can use the Currency Module in your application.
+
+## List Currencies
+
+<CodeTabs groupId="app-type">
+  <CodeTab label="Medusa API Router" value="medusa">
+
+  ```ts
+  import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
+  import { ICurrencyModuleService } from "@medusajs/types"
+  import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+
+  export async function GET(
+    req: MedusaRequest,
+    res: MedusaResponse
+  ): Promise<void> {
+    const currencyModuleService: ICurrencyModuleService =
+      req.scope.resolve(ModuleRegistrationName.CURRENCY)
+
+    res.json({
+      currencies: await currencyModuleService.list(),
+    })
+  }
+  ```
+
+  </CodeTab>
+  <CodeTab label="Next.js App Router" value="nextjs">
+
+  ```ts
+  import { NextResponse } from "next/server"
+
+  import {
+    initialize as initializeCurrencyModule,
+  } from "@medusajs/currency"
+
+  export async function GET(request: Request) {
+    const currencyModuleService = await initializeCurrencyModule()
+
+    return NextResponse.json({
+      currencies: await currencyModuleService.list(),
+    })
+  }
+  ```
+
+  </CodeTab>
+</CodeTabs>
+
+---
+
+## Retrieve a Currency by its ID
+
+<CodeTabs groupId="app-type">
+  <CodeTab label="Medusa API Router" value="medusa">
+
+  ```ts
+  import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
+  import { ICurrencyModuleService } from "@medusajs/types"
+  import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+
+  export async function GET(
+    req: MedusaRequest,
+    res: MedusaResponse
+  ): Promise<void> {
+    const currencyModuleService: ICurrencyModuleService =
+      req.scope.resolve(ModuleRegistrationName.CURRENCY)
+
+    const currency = await currencyModuleService.retrieve("usd")
+
+    res.json({
+      currency,
+    })
+  }
+  ```
+
+  </CodeTab>
+  <CodeTab label="Next.js App Router" value="nextjs">
+
+  ```ts
+  import { NextResponse } from "next/server"
+
+  import {
+    initialize as initializeCurrencyModule,
+  } from "@medusajs/currency"
+
+  export async function GET(
+    request: Request
+  ) {
+    const currencyModuleService = await initializeCurrencyModule()
+
+    const currency = await currencyModuleService.retrieve("usd")
+
+    return NextResponse.json({ currency })
+  }
+  ```
+
+  </CodeTab>
+</CodeTabs>
+
+---
+
+## More Examples
+
+The [Currency Module interface reference](/references/currency) provides a reference to all the methods available for use with examples for each.

www/apps/resources/app/commerce-modules/currency/page.mdx

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+import { CodeTabs, CodeTab } from "docs-ui"
+
+export const metadata = {
+  title: `Currency Module`,
+}
+
+# {metadata.title}
+
+The Currency Module is the `@medusajs/currency` NPM package that provides currency-related features in your Medusa and Node.js applications.
+
+---
+
+## Features
+
+### Currency Retrieval
+
+List and retrieve currencies stored in your application.
+
+By default, the module, on application start, adds currencies defined in [this file](https://github.com/medusajs/medusa/blob/develop/packages/utils/src/defaults/currencies.ts) to the database.
+
+```ts
+const currency = await currencyModuleService.retrieve("usd")
+```
+
+### Support Currencies in Modules
+
+Other commerce modules use currency codes in their models or operations. You can use the Currency Module to retrieve a currency code and its details.
+
+An example with the Region Module:
+
+```ts
+const region = await regionModuleService.retrieve("reg_123")
+const currency = await currencyModuleService.retrieve(
+  region.currency_code
+)
+```
+
+---
+
+## Configure Currency Module
+
+After installing the `@medusajs/currency` package in your Medusa application, add it to the `modules` object in `medusa-config.js`:
+
+```js title="medusa-config.js"
+const modules = {
+  // ...
+  currency: {
+    resolve: "@medusajs/currency",
+  },
+}
+```
+
+---
+
+## How to Use Currency Module's Service
+
+You can use the Currency Module's main service by resolving from the Medusa container the resource `ModuleRegistrationName.CURRENCY` imported from `@medusajs/modules-sdk`.
+
+For example:
+
+<CodeTabs groupId="resource-type">
+  <CodeTab label="API Route" value="api-route">
+
+  ```ts title="src/api/store/custom/route.ts"
+  import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
+  import { ICurrencyModuleService } from "@medusajs/types"
+  import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+
+  export async function GET(
+    req: MedusaRequest,
+    res: MedusaResponse
+  ): Promise<void> {
+    const currencyModuleService: ICurrencyModuleService =
+      req.scope.resolve(ModuleRegistrationName.CURRENCY)
+
+    res.json({
+      currencies: await currencyModuleService.list(),
+    })
+  }
+  ```
+
+  </CodeTab>
+  <CodeTab label="Subscriber" value="subscribers">
+
+  ```ts title="src/subscribers/custom-handler.ts"
+  import { SubscriberArgs } from "@medusajs/medusa"
+  import { ICurrencyModuleService } from "@medusajs/types"
+  import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+
+  export default async function subscriberHandler({
+    container,
+  }: SubscriberArgs) {
+    const currencyModuleService: ICurrencyModuleService =
+      container.resolve(ModuleRegistrationName.CURRENCY)
+
+    const currencies = await currencyModuleService.list()
+  }
+  ```
+
+  </CodeTab>
+  <CodeTab label="Workflow Step" value="workflow-step">
+
+  ```ts title="src/workflows/hello-world/step1.ts"
+  import { createStep } from "@medusajs/workflows-sdk"
+  import { ICurrencyModuleService } from "@medusajs/types"
+  import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+
+  const step1 = createStep("step-1", async (_, context) => {
+    const currencyModuleService: ICurrencyModuleService =
+      context.container.resolve(
+        ModuleRegistrationName.CURRENCY
+      )
+    
+    const currencies = await currencyModuleService.list()
+  })
+  ```
+
+  </CodeTab>
+</CodeTabs>