containers: Update ws README for podman container hosts
containers: Update ws README for podman container hosts

Still keep the atomic documentation, as RHEL Atomic will be around for
several years still.

Fixes #11002

martinpitt/cockpit,cockpituous/cockpit,cockpituous/cockpit,mvollmer/cockpit,mvollmer/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,cockpituous/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,garrett/cockpit,deryni/cockpit,deryni/cockpit,cockpituous/cockpit,mvollmer/cockpit,moraleslazaro/cockpit