Put discussion of how to access the API ahead of discussion about
how to access other services on the cluster.
More clearly distinguish the different kinds of proxies.
Explain pros and cons of different approaches better.
Remove cluster-admin-oriented documentation from user guide.
More links.
The User's guide is for anyone who wants to run programs and services on an exisiting Kubernetes cluster.
The Cluster Admin's guide is for anyone setting up a Kubernetes cluster or administering it.
The Developer guide is for anyone wanting to write programs that access the kubernetes API,
write plugins or extensions, or modify the core code of kubernetes.