docs: update api-reference project for v2 (#7307)

* remove everything v1 and make v2 default

* move main v2 rewrites to book

* move rewrites to book + other fixes

www/apps/api-reference/app/_mdx/client-libraries.mdx

@@ -0,0 +1,20 @@
+import Space from "@/components/Space"
+import DownloadFull from "@/components/DownloadFull"
+
+### Just Getting Started?
+
+Check out the [quickstart guide](https://docs.medusajs.com/create-medusa-app).
+
+<Space bottom={8} />
+
+<Note type="soon">
+
+Support for v2 API Routes is coming soon in Medusa JS Client and Medusa React.
+
+</Note>
+
+### Download Full Reference
+
+Download this reference as an OpenApi YAML file. You can import this file to tools like Postman and start sending requests directly to your Medusa backend.
+
+<DownloadFull />