Update - Running and Deploying LLMs using Red Hat OpenShift AI on ROSA cluster and Storing the Model in Amazon S3 Bucket

[kumuduh]

https://cloud.redhat.com/experts/rhoai/rosa-s3

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/