docs: Expand README on OLM operator install

[olivergondza]

What type of PR is this?

Uncomment only one /kind line, and delete the rest. For example, > /kind bug would simply become: /kind bug

/kind bug /kind cleanup /kind failing-test /kind enhancement /kind documentation /kind code-refactoring

What does this PR do / why we need it:

Add details for deploying the operators, troubleshooting steps, etc.

Have you updated the necessary documentation?

• [no] Documentation update is required by this PR.
• [YES] Documentation has been updated.

Which issue(s) this PR fixes:

None

Test acceptance criteria:

• [n/a] Unit Test
• [n/a] E2E Test

How to test changes / Special notes to the reviewer:

[openshift-ci[bot]]

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[olivergondza]

Any comments, objections?