Adjust link into overview page (#1089)

* Adjust link into overview page

I've adjusted the link to the installation page, I think that's the right page.

* Better separation in text

Author: iaurg

docs/src/pages/docs/overview.md

@@ -85,4 +85,4 @@ function Example() {
 ## You talked me into it, so what now?
 
 - Consider taking the [React Query Essentials Course](https://learn.tanstack.com) (or buying it for your whole team!)
-- Learn React Query at your own pace with our amazingly thorough [guides and API documentation](./guides/installation)
+- Learn React Query at your own pace with our amazingly thorough [guides](/docs/installation) and [API documentation](/docs/api)