Use Pelorus Operator as first-class citizen for our docs

[mpryc]

Update docs to ensure pelorus operator is covered.

Signed-off-by: Michal Pryc mpryc@redhat.com

Testing Instructions

https://pelorus--767.org.readthedocs.build/en/767/

@redhat-cop/mdt

[mpryc]

/hold

[mateusoliveira43]

I would also apply some changes I made here #759

• Move install to the top to be the first section of getting started
• Remove Pelorus installation steps from demo (quickstart tutorial) and add a reference to it

[EDITED] we merged #759, so all this changes were applied

[mpryc]

/unhold

[mpryc]

/retest

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mateusoliveira43
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[mpryc]

Approved by @mateusoliveira43 merging without waiting for the e2e tests as it's just doc update, so no real need for those to end.

[openshift-ci]

@mpryc: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/4.8-e2e-openshift	90cb253	link	false	/test 4.8-e2e-openshift

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