docs: add routing page (#9550)

- Add a new homepage to `book` project for the routing page
- Move all main doc pages to be under `/v2/learn` (and added redirects + fixed links across docs)
- Other: add admin components to resources dropdown + fixes to search on mobile.

Closes DX-955

Preview: https://docs-v2-git-docs-router-page-medusajs.vercel.app/v2

www/apps/book/components/Homepage/Footer/index.tsx

@@ -0,0 +1,24 @@
+import clsx from "clsx"
+import Feedback from "../../Feedback"
+import EditButton from "../../EditButton"
+
+const HomepageFooter = () => {
+  return (
+    <div className="py-4 w-full">
+      <div
+        className={clsx(
+          "flex flex-col lg:flex-row gap-2 justify-between lg:items-center",
+          "xl:mx-auto xl:max-w-[1136px] w-full px-1 sm:px-4 xl:px-0"
+        )}
+      >
+        <Feedback
+          showDottedSeparator={false}
+          question="Was this page helpful?"
+        />
+        <EditButton />
+      </div>
+    </div>
+  )
+}
+
+export default HomepageFooter