Update course link (#6545)

Author: tylermcginnis

docs/react/overview.md

@@ -95,7 +95,7 @@ function Example() {
 
 ## You talked me into it, so what now?
 
-- Consider taking the official [React Query Course](https://ui.dev/react-query?from=tanstack) (or buying it for your whole team!)
+- Consider taking the official [React Query Course](https://query.gg?s=tanstack) (or buying it for your whole team!)
 - Learn React Query at your own pace with our amazingly thorough [Walkthrough Guide](../installation) and [API Reference](../reference/useQuery)
 
 [//]: # 'Materials'