nicer readme (#333)

Author: foxish

README.md

@@ -8,7 +8,7 @@ This is a collaboratively maintained project working on [SPARK-18278](https://is
 
 ## Getting Started
 
-- [Usage guide](docs/running-on-kubernetes.md) shows how to run the code
+- [Usage guide](https://apache-spark-on-k8s.github.io/userdocs/) shows how to run the code
 - [Development docs](resource-managers/kubernetes/README.md) shows how to get set up for development
 - Code is primarily located in the [resource-managers/kubernetes](resource-managers/kubernetes) folder
 

docs/running-on-kubernetes.md

@@ -149,8 +149,6 @@ environment variable in your Dockerfiles.
 
 ### Accessing Kubernetes Clusters
 
-For details about running on public cloud environments, such as Google Container Engine (GKE), refer to [running Spark in the cloud with Kubernetes](running-on-kubernetes-cloud.md).
-
 Spark-submit also supports submission through the
 [local kubectl proxy](https://kubernetes.io/docs/user-guide/accessing-the-cluster/#using-kubectl-proxy). One can use the
 authenticating proxy to communicate with the api server directly without passing credentials to spark-submit.