Point out the Sales Demo

Add URL pointing to the Sales Demo in the handbook

README.md

@@ -2,7 +2,7 @@
 This work is based  partially on: https://github.com/lwolf/kubernetes-gitlab/. GitLab would like to thank Sergey Nuzhdin for his work.
 
 This series of manifests are provided in a templated manner, for the deployment
-and testing of [GitLab](https://about.gitlab.com) on [Kubernetes](https://kubernetes.io/) via [Google Container Engine](https://cloud.google.com/container-engine/). These templates are used in the GitLab Idea to Production demo on GKE
+and testing of [GitLab](https://about.gitlab.com) on [Kubernetes](https://kubernetes.io/) via [Google Container Engine](https://cloud.google.com/container-engine/). These templates are used in the [GitLab Idea to Production demo on GKE presentation](https://about.gitlab.com/handbook/sales/demo/) from the [GitLab handbook](https://about.gitlab.com/handbook).
 
 Terms: