It would be beneficial to have a dedicated docs page for docker backend where we can describe specifics of the docker backend, list the capabilities and limitations, etc.

For instance, now the backend installs the monitoring stack directly on the host system, not on a dedicated docker instance. But due to SCT installs scylla-manager server on monitoring node, we need to skip manager use in case of docker backend.
This is an example of limitation that is not mentioned explicitly in docs and occasionally causes devs to run test configurations that are not fit for the docker backend, resulting in new SCT issue reports.