move article to its topic-related dir, update links

doc/articles/index.md

@@ -74,7 +74,6 @@ upgrade, integrate, migrate to GitLab:
 | :------------ | :------: | --------------: |
 | [Video Tutorial: Idea to Production on Google Container Engine (GKE)](https://about.gitlab.com/2017/01/23/video-tutorial-idea-to-production-on-google-container-engine-gke/) | Tutorial | 2017-01-23 |
 | [How to Setup a GitLab Instance on Microsoft Azure](https://about.gitlab.com/2016/07/13/how-to-setup-a-gitlab-instance-on-microsoft-azure/) | Tutorial | 2016-07-13 |
-| [Get started with OpenShift Origin 3 and GitLab](openshift_and_gitlab/index.md) | Tutorial | 2016-06-28 |
 | [Getting started with GitLab and DigitalOcean](https://about.gitlab.com/2016/04/27/getting-started-with-gitlab-and-digitalocean/) | Tutorial | 2016-04-27 |
 
 ## Software development

doc/install/README.md

@@ -27,7 +27,7 @@ the hardware requirements.
 
 - [Installing in Kubernetes](kubernetes/index.md) - Install GitLab into a Kubernetes
   Cluster using our official Helm Chart Repository.
-- [Install GitLab on OpenShift](../articles/openshift_and_gitlab/index.md)
+- [Install GitLab on OpenShift](openshift_and_gitlab/index.md)
 - [Install GitLab on DC/OS](https://mesosphere.com/blog/gitlab-dcos/) via [GitLab-Mesosphere integration](https://about.gitlab.com/2016/09/16/announcing-gitlab-and-mesosphere/)
 - [Install GitLab on Azure](azure/index.md)
 - [Install GitLab on Google Cloud Platform](google_cloud_platform/index.md)