chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/user-guide/app/customers/manage/page.mdx

@@ -0,0 +1,52 @@
+---
+sidebar_position: 1
+---
+
+import { EllipsisHorizontal } from "@medusajs/icons"
+
+export const metadata = {
+  title: `Manage Customers`,
+}
+
+# {metadata.title}
+
+In this document, you’ll learn how to manage customers and their details.
+
+## Create a Customer
+
+To create a customer:
+
+1. Go to the Customers page.
+2. Click the Create button.
+3. In the form that opens, enter the customer's details such as first and last name, email, and password.
+4. Once you're done, click the Create button.
+
+---
+
+## View Customer Details
+
+To view a customer’s details:
+
+1. Go to the Customers page.
+2. Click on the customer you want to view.
+
+---
+
+## Edit Customer Details
+
+To edit a customer’s details:
+
+1. Go to a Customer’s details page.
+2. Click on the <InlineIcon Icon={EllipsisHorizontal} alt="three dots" /> icon in the first section.
+3. Choose Edit from the dropdown.
+4. In the drawer that opens, edit the customer’s details.
+5. Once you’re done, click the Save button.
+
+---
+
+## View Customer Orders
+
+To view the orders of a customer:
+
+1. Go to a Customer’s details page.
+2. Find the customer's orders under the Orders section.