Update docs for Podman support

[signed-log]

Running diun on Podman (default container runtime on RHEL, CentOS...) needs a workaround to work, this doc change treats that

[crazy-max]

Was starting to review but I think it should be on a dedicated page named "Podman" under Installation section.

[signed-log]

I think so too, will do that

[crazy-max]

@Stig124 If you want to test documentation locally you can use the following commands:

# Build mkdocs image
docker build -t mkdocs -f ./hack/docs.Dockerfile --target base .
# Run mkdocs image and watch for changes
docker run --rm -it -p 8000:8000 -v $(pwd):/docs mkdocs
# Open http://localhost:8000 on your browser

[signed-log]

And it is done

[signed-log]

@Stig124 If you want to test documentation locally you can use the following commands:

# Build mkdocs image
docker build -t mkdocs -f ./hack/docs.Dockerfile --target base .
# Run mkdocs image and watch for changes
docker run --rm -it -p 8000:8000 -v $(pwd):/docs mkdocs
# Open http://localhost:8000 on your browser

This should definitely be part of the contributing docs as it is really useful

[crazy-max]

Overall lgtm minus small changes. Also I'm a little concerned about the TOC like:

##### Rootful (`root` user)

Can you make it less cumbersome?

[crazy-max]

LGTM thanks!