Remove Janus IDP information from console Quick starts [4.16]

Description of problem:
The OpenShift Console QuickStarts promotes RHDH but also includes Janus IDP information.

The Janus IDP quick starts should be removed and all information about Janus IDP should be removed.

Version-Release number of selected component (if applicable):
4.15

How reproducible:
Always

Steps to Reproduce:
Just navigate to Quick starts and select the "Install Red Hat Developer Hub (RHDH) with an Operator" quick starts

Actual results:

1. The RHDH Operator Quick start contains some information and links to Janus IDP.
2. The Janus IDP Quick start exists and is similar to the RHDH one.

Expected results:

1. The RHDH Operator Quick start must not contain information about Janus IDP.
2. The Janus IDP Quick start should be removed

Additional info:
Initial PR: https://github.com/openshift/console-operator/pull/806