fix the template app links (#5701)

README.md

@@ -12,7 +12,7 @@ This project hosts the JavaScript versions of [Realm](https://realm.io/). Curren
 * **Simple:** Data is directly [exposed as objects](https://docs.mongodb.com/realm/node/realms/) and [queryable by code](https://docs.mongodb.com/realm/node/query-engine/), removing the need for ORM's riddled with performance & maintenance issues.
 * **Modern:** Realm supports relationships, generics, and vectorization.
 * **Fast:** Realm is faster than even raw SQLite on common operations, while maintaining an extremely rich feature set.
-* **[Device Sync](https://www.mongodb.com/atlas/app-services/device-sync)**: Makes it simple to keep data in sync across users, devices, and your backend in real-time. [Get started](http://mongodb.com/realm/register?utm_medium=github_atlas_CTA&utm_source=realm_js_github) for free with a template application that includes a cloud backend and Sync.
+* **[Device Sync](https://www.mongodb.com/atlas/app-services/device-sync)**: Makes it simple to keep data in sync across users, devices, and your backend in real-time. Get started for free with [a template application](https://github.com/mongodb/template-app-react-native-todo) and [create the cloud backend](http://mongodb.com/realm/register?utm_medium=github_atlas_CTA&utm_source=realm_js_github).
 
 ## Getting Started