[README] Installation documents points to the page not found

[adityaramteke]

The issue should be fixed in the Installation README document which points to page not found:

These steps assume your OpenShift deployment has the default set of ImageStreams defined. Instructions for installing the default ImageStreams are available here.

[b-long]

Adding some detail, the broken link is in this section: https://github.com/sclorg/cakephp-ex#installation

Quote:

These steps assume your OpenShift deployment has the default set of ImageStreams defined. Instructions for installing the default ImageStreams are available here. If you are defining the set of ImageStreams now, remember to pass in the proper cluster-admin credentials and to create the ImageStreams in the 'openshift' namespace.

The anchor "here" points to the following broken link: https://docs.okd.io/latest/install_config/imagestreams_templates.html#creating-image-streams-for-openshift-images