[CI:DOCS] Add info on the quay.io images to the README.md

[TomSweeneyRedHat]

Add information and a link for the quay.io imges to the README.md

Does this PR introduce a user-facing change?

None

[TomSweeneyRedHat]

@cevich PTAL

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[mheon]

/lgtm

[mheon]

We might want to consider an overhaul of troubleshooting.md, there's a bunch of stuff in there from 4 years ago that is no longer relevant.