Context

https://github.com/redhat-developer/red-hat-developers-documentation-rhdh/pull/700#issuecomment-2493906401 

Description

RHIDP-2707 is clarifying that the Operator installation requires OLM. As such, it removes the non-OLM steps for deploying the operator on EKS.

As a follow-up ( https://issues.redhat.com/browse/RHIDP-2707?focusedId=26065025&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-26065025 ), we should also update the instructions for AKS: https://docs.redhat.com/en/documentation/red_hat_developer_hub/1.3/html/installing_red_hat_developer_hub_on_microsoft_azure_kubernetes_service/proc-rhdh-deploy-aks-operator_title-install-rhdh-aks#proc-rhdh-deploy-aks-operator_title-install-rhdh-aks

Right now, the first step in this procedure is `Obtain the Red Hat Developer Hub Operator manifest file, named rhdh-operator-<VERSION>.yaml [...]` (with no information on how to obtain that manifest), then `Apply the modified Operator manifest to your Kubernetes cluster`. There is no mention of OLM there.

NOTE: The instructions to install the Operator with OLM should be quite similar on AKS/EKS/GKE, so it might be worth refactoring and reusing content in those docs.