Update - Creating Images using Stable Diffusion on Red Hat OpenShift AI on ROSA cluster with GPU enabled

[kumuduh]

https://cloud.redhat.com/experts/rhoai/rosa-gpu

test on 4.20 + and add an information banner saying "This guide has been validated on OpenShift 4.20. Operator CRD names, API versions, and console paths may differ on other versions." as this doc has https://cloud.redhat.com/experts/rosa/eso/