Gramatical fix to kompose introduction (kubernetes#7792)

The original wording didn't through very well. As much of the original sentence has been preserved as possible, primarily to ensure the kompose web address is see both in text and as a href link.

docs/tools/kompose/user-guide.md

@@ -16,7 +16,7 @@ redirect_from:
 
 What's Kompose? It's a conversion tool for all things compose (namely Docker Compose) to container orchestrators (Kubernetes or OpenShift).
 
-More information can be found our website at [http://kompose.io](http://kompose.io)
+More information can be found on the Kompose website at [http://kompose.io](http://kompose.io).
 
 In three simple steps, we'll take you from Docker Compose to Kubernetes.