Fixed broken README link for common use cases

Signed-off-by: Zuhayr Elahi <[email protected]>

README.md

@@ -10,7 +10,7 @@ see [the list of features](https://github.com/docker/docker.github.io/blob/maste
 
 Compose is great for development, testing, and staging environments, as well as
 CI workflows. You can learn more about each case in
-[Common Use Cases](https://github.com/docker/docker.github.io/blob/master/compose/overview.md#common-use-cases).
+[Common Use Cases](https://github.com/docker/docker.github.io/blob/master/compose/index.md#common-use-cases).
 
 Using Compose is basically a three-step process.