Combine docker-containers into monitor

### Description

Hey hey!

I use a variety of services at the moment - TrueNas holds my docker containers, my router has Adguard Home and my VPN. I have external sites that i monitor as well. I use the monitor widget at the moment to check what's up and link out to each one on my glance dashboard.

However, I love the docker-containers feature of nesting certain containers under a parent container. Especially now since I can define it in my `glance.yaml` instead of adding labels ^-^

While I theoretically could have separate tabs / widgets - 1 for my docker containers, and 1 for everything else, it would be really cool if I could combine the two so I can have parent / child containers in my monitor widget.

In my head, the two honestly share a similar goal. One is just more specialized than the other. I feel like that docker-containers can just be a subtype of the monitor widget potentially?

Thanks!