fix: Add "Next steps" to React Router quickstart (#1874)

Co-authored-by: Alexis Aguilar <[email protected]>

docs/quickstarts/react-router.mdx

@@ -31,7 +31,9 @@ description: Learn how to use Clerk to quickly and easily add secure authenticat
   - Add `<ClerkProvider>` and Clerk components
 </TutorialHero>
 
-Clerk's [React Router SDK](/docs/references/react-router/overview) provides prebuilt components, hooks, and stores to make it easy to integrate authentication and user management in your React Router app. This guide assumes that you're using [React Router v7 or later](https://api.reactrouter.com/v7).
+Clerk's [React Router SDK](/docs/references/react-router/overview) provides prebuilt components, hooks, and stores to make it easy to integrate authentication and user management in your React Router app.
+
+This guide assumes that you're using [React Router v7 or later](https://api.reactrouter.com/v7) in framework mode. To use React Router as a library instead, see the [library mode guide](/docs/references/react-router/library-mode).
 
 > [!WARNING]
 > Due to an active [issue with React Router](https://github.com/remix-run/react-router/issues/12475), Clerk and React Router currently requires using Node.js 22.11 or lower.
@@ -221,3 +223,20 @@ Clerk's [React Router SDK](/docs/references/react-router/overview) provides preb
 
   Visit your app's homepage at [`http://localhost:5173`](http://localhost:5173). Sign up to create your first user.
 </Steps>
+
+## Next steps
+
+<Cards>
+  - [Add custom sign-up and sign-in pages](/docs/references/react-router/custom-signup-signin-pages)
+  - Learn how to add custom sign-up and sign-in pages to your React Router app with Clerk's prebuilt components.
+
+  ---
+
+  - [Read session and user data](/docs/references/react-router/read-session-data)
+  - Learn how to use Clerk's hooks and helpers to access the active session and user data in your React Router app.
+
+  ---
+
+  - [Library mode](/docs/references/react-router/library-mode)
+  - Learn how to use Clerk with React Router in library mode to add authentication to your application.
+</Cards>