Description of the problem:
In the current version of the documentation for installing the orchestrator via Operatorhub, it is not clear that running the setup.sh script is a dependency for installing the operator with RHDH.

How reproducible: 100%

Steps to reproduce:

1. Follow the manual instructions to install the Orchestrator operator. The operator should install RHDH.

Actual results:
It isn't clear how to config all of the required secrets for the RHDH instance without using the setup.sh script.
When trying to install the Orchestrator in orchestrator namespace, the action fails with:
message: 'failed to install release: execution error at (orchestrator/templates/rhdh-operator.yaml:30:8): Secret backstage-backend-auth-secret not found in namespace rhdh-operator'
Expected results:
Instructions to use setup script should be added to installation docs for using operatorhub (it is there for manual install). Ideally the operator would create the secret itself in the required namespace, so that we would not have an external dependency.