doc(README.md): use introductory text from the docs

Author: Aaron Schlesinger

README.md

@@ -4,7 +4,7 @@
 [![codecov.io](https://codecov.io/github/deis/workflow/coverage.svg?branch=master)](https://codecov.io/github/deis/workflow?branch=master)
 [![Docker Repository on Quay](https://quay.io/repository/deisci/controller/status "Docker Repository on Quay")](https://quay.io/repository/deisci/controller)
 
-Deis (pronounced DAY-iss) is an open source PaaS that makes it easy to deploy and manage applications on your own servers. Deis builds on Kubernetes to provide a lightweight, easy and secure way to deploy your code to production.
+Deis (pronounced DAY-iss) Workflow is an open source Platform as a Service (PaaS) that adds a developer-friendly layer to any [Kubernetes](http://kubernetes.io) cluster, making it easy to deploy and manage applications on your own servers.
 
 For more information about the Deis Workflow, please visit the main project page at https://github.com/deis/workflow.