Add section on Toolbox and podman

[ojn]

First there ought to be a topic called containers where Docker is one of the possible tools.
Then maybe this article could be a good starting point.

https://fedoramagazine.org/a-quick-introduction-to-toolbox-on-fedora/

[pvalena]

Docker page is here: https://developer.fedoraproject.org/tools/docker/about.html