chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/user-guide/app/settings/sales-channels/manage/page.mdx

@@ -0,0 +1,53 @@
+---
+sidebar_position: 1
+---
+
+import { EllipsisHorizontal } from "@medusajs/icons"
+
+export const metadata = {
+  title: `Manage Sales Channels`,
+}
+
+# {metadata.title}
+
+In this document, you’ll learn how to manage sales channels in your Medusa Admin.
+
+## Create a Sales Channel
+
+To create a sales channel:
+
+1. Go to Settings → Sales Channels.
+2. Click the Create button.
+3. In the form that opens, enter the sales channel's details.
+4. Once you're done, click the Save button.
+
+---
+
+## Edit a Sales Channel
+
+To edit a sales channel:
+
+1. Go to Settings → Sales Channels.
+2. Find the sales channel in the list and click on it.
+3. Click the <InlineIcon Icon={EllipsisHorizontal} alt="three-dots" /> icon at the top right of the first section.
+4. Choose Edit from the dropdown.
+5. In the drawer that opens, edit the sales channel's details.
+6. Once you're done, click the Save button.
+
+---
+
+## Delete a Sales Channel
+
+<Note type="warning">
+
+Deleting a sales channel is irreversible.
+
+</Note>
+
+To delete a sales channel:
+
+1. Go to Settings → Sales Channels.
+2. Find the sales channel in the list and click on it.
+3. Click the <InlineIcon Icon={EllipsisHorizontal} alt="three-dots" /> icon at the top right of the first section.
+4. Choose Delete from the dropdown.
+5. Confirm deleting the sales channel by entering its name in the field and clicking the Delete button in the pop-up.

www/apps/user-guide/app/settings/sales-channels/page.mdx

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+---
+sidebar_position: 8
+---
+
+export const metadata = {
+  title: `Sales Channels`,
+}
+
+# {metadata.title}
+
+In this document, you’ll get an overview of sales channels in Medusa.
+
+## What is a Sales Channel?
+
+A sales channel is a channel that you sell your products through. For example, you can have a sales channel for the web storefront, another for the mobile app, and another for selling across social media platforms.
+
+By default, there’s a default sales channel in a Medusa store. You can add multiple sales channels.
+
+---
+
+## How Sales Channels Work
+
+Sales channels are associated with data and settings in your commerce store:
+
+- You can choose which products are available in a sales channel.
+- When a customer places an order from a sales channel, the order is associated with it.
+- Locations used with inventory are also associated with sales channels.
+
+---
+
+## Sales Channels Settings Overview
+
+To view the available sales channels and settings, go to Settings → Sales channels.
+
+The sales channels settings page shows available sales channels and allows you to manage sales channels.
+
+---
+
+## Learn More About Sales Channels
+
+- [Manage Sales Channels](./manage/page.mdx)
+- [Manage Products in Sales Channels](./products/page.mdx)

www/apps/user-guide/app/settings/sales-channels/products/page.mdx

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+---
+sidebar_position: 2
+sidebar_label: Manage Products
+---
+
+import { EllipsisHorizontal } from "@medusajs/icons"
+
+export const metadata = {
+  title: `Manage Products in Sales Channels`,
+}
+
+# {metadata.title}
+
+In this document, you’ll learn how to manage products in Sales Channels.
+
+<Note>
+
+This guide covers managing products from the Sales Channels page. It’s also possible to manage the Sales Channels of products in the Products page.
+
+</Note>
+
+## Add Products to Sales Channels
+
+To add products to a sales channel:
+
+1. Go to Settings → Sales Channels
+2. Find the sales channel in the list and click on it.
+3. Under the Products section, click the Add button at the top right.
+4. In the list of products shown, check the checkboxes next to the products to add.
+5. Once you're done, click the Save button.
+
+---
+
+## Remove Product from Sales Channel
+
+To remove a product from a sales channel:
+
+1. Go to Settings → Sales Channels
+2. Find the sales channel in the list and click on it.
+3. Under the Products section, find the product to remove and click on the <InlineIcon Icon={EllipsisHorizontal} alt="three-dots" /> icon to its right.
+4. Choose Remove from the dropdown.