Use a working link in README.md

While this is not the same content, it's likely the closest one. I didn't find anything more close or the same content as before any more.

README.md

@@ -7,7 +7,7 @@ This repository contains Dockerfiles for PostgreSQL images for OpenShift.
 Users can choose between RHEL, Fedora and CentOS based images.
 
 For more information about using these images with OpenShift, please see the
-official [OpenShift Documentation](https://docs.okd.io/latest/using_images/db_images/postgresql.html).
+official [OpenShift Documentation](https://docs.okd.io/latest/openshift_images/using-templates.html).
 
 For more information about contributing, see
 [the Contribution Guidelines](https://github.com/sclorg/welcome/blob/master/contribution.md).