Recommendation when exposing containers through podman sites

[fgiorgetti]

On the podman sites section of the documentation, it would be nice to explain that if the podman network to be used is created by Skupper, it will be removed when the site is deleted.

When a podman network is removed, all containers connected to it are also removed.

So if someone is planning to expose podman containers through Skupper, we should recommend that users create their own podman network.

[pwright]

@fgiorgetti Is the example a good illustration of this approach?

https://github.com/skupperproject/skupper-example-podman?tab=readme-ov-file#step-7-expose-the-backend

[fgiorgetti]

@pwright It is a good example of how to expose a podman container as a skupper service.
Along with this, it would be good if a warning or note could be added stating that it is recommended
to create the podman network yourself, as if skupper does that, then all connected containers are also
removed.