Consider a version mapping table for Operator and associated Chart versions

Context: #418 (comment 735726513)

Summary

Let's consider making a version table mapping Operator versions to associated Chart versions. The purpose would be to make it easier to reference which Chart versions can be used with any given Operator version without needing to go check the CHART_VERSIONS file on each Operator tag.

It would likely be similar to https://docs.gitlab.com/charts/installation/version_mappings.html.

Acceptance criteria

• Version mapping table ideas are presented
• If table seems helpful, then it is implemented in Operator docs