chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/user-guide/sidebar.mjs

@@ -0,0 +1,58 @@
+import { sidebarAttachHrefCommonOptions } from "build-scripts"
+
+// TODO check the order of items based on the Medusa Admin's sidebar
+
+/** @type {import('types').RawSidebarItemType[]} */
+export const sidebar = sidebarAttachHrefCommonOptions([
+  {
+    path: "/",
+    title: "Introduction",
+  },
+  {
+    title: "Tips",
+    hasTitleStyling: true,
+    autogenerate_path: "/tips",
+  },
+  {
+    path: "/orders",
+    title: "Orders",
+    hasTitleStyling: true,
+    autogenerate_path: "/orders",
+  },
+  {
+    path: "/products",
+    title: "Products",
+    hasTitleStyling: true,
+    autogenerate_path: "/products",
+  },
+  {
+    path: "/inventory",
+    title: "Inventory",
+    hasTitleStyling: true,
+    autogenerate_path: "/inventory",
+  },
+  {
+    path: "/customers",
+    title: "Customers",
+    hasTitleStyling: true,
+    autogenerate_path: "/customers",
+  },
+  {
+    path: "/discounts",
+    title: "Discounts",
+    hasTitleStyling: true,
+    autogenerate_path: "/discounts",
+  },
+  {
+    path: "/pricing",
+    title: "Pricing",
+    hasTitleStyling: true,
+    autogenerate_path: "/pricing",
+  },
+  {
+    path: "/settings",
+    title: "Settings",
+    hasTitleStyling: true,
+    autogenerate_path: "/settings",
+  },
+])