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add deprecation notice and links to new repo, issues, and images.

README.md

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 # Backstage Operator
 
+## DEPRECATION WARNING
+
+As of August 2024, this repo is deprecated and read-only.
+
+Please continue to work on this project in the following places:
+
+* Code has moved to https://github.com/redhat-developer/rhdh-operator
+* Issues can be reported at https://issues.redhat.com/browse/RHIDP
+* CI images can be found at https://quay.io/repository/rhdh/rhdh-rhel9-operator?tab=info
+
+
 ## The Goal
 The Goal of [Backstage](https://backstage.io) Operator project is creating Kubernetes Operator for configuring, installing and synchronizing Backstage instance on Kubernetes/OpenShift. 
 The initial target is in support of Red Hat's assemblies of Backstage - specifically supporting [dynamic-plugins](https://github.com/janus-idp/backstage-showcase/blob/main/showcase-docs/dynamic-plugins.md) on OpenShift. This includes [Red Hat Developer Hub (RHDH)](https://developers.redhat.com/rhdh) but may be flexible enough to install any compatible Backstage instance on Kubernetes. See additional information under [Configuration](docs/configuration.md).