provide docs for K8s PSP to Gatekeeper policy adoption

[sozercan]

Provide docs on how users can adopt GK PSP equivalent policies

[JaveriaK]

Please also add some more detail around what the behavior is for policies implemented by both PSP and Gatekeeper constraints in the same cluster. Is it ok to run both of these policy enforcement validation webhooks simultaneously? When both get called is there a precedence or race condition?

[stale[bot]]

This issue/PR has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.