[docs] Update images and add s2i variants

[kstrenkova]

This change is a documentation update following the new s2i images support. The tcib images can still be used, so the wording is update a bit and explanation for the new s2i images is added.

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[centosinfra-prod-github-app]

Build succeeded (check pipeline).
https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/70b414a74b6e43dda1422607e1997697

✔️ test-operator-s2i-content-provider SUCCESS in 3h 12m 58s (non-voting)
✔️ test-operator-kuttl-s2i SUCCESS in 36m 04s (non-voting)
✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 49m 41s
✔️ test-operator-kuttl SUCCESS in 38m 20s