Add subnet and gateway to network config pane

**Is your feature request related to a problem? Please describe.**
When running a Rails app that uses the `better_errors` gem, the gem needs to be given this range in the config in order for it to display when running under Docker, as otherwise it will only work on localhost.

I can't get this information through lazydocker, though: when I select a network in the left pane, it shows the network config on the right, but does not show the IP range assigned to the network — I need to run `docker network inspect networkname` outside of lazydocker to find that out.

**Describe the solution you'd like**
The information is available at `IPAM.Config.Subnet`, and could be displayed in the config pane when a network is selected. (The gateway might be useful to some people, too, though it's not needed in my case…)

```
[
{
"Name": "networkname_default",
"Id": "5a5730fc170cdafbd548b3dbb54365d5f73186bf9756185f968023aa04ed3412",
"Created": "2024-07-18T12:11:48.881400701+01:00",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.20.0.0/16",
"Gateway": "172.20.0.1"
}
]
},
```

**Describe alternatives you've considered**
Manually running `docker network inspect networkname` and picking through the output to find what I need. That's not very lazy, though :grin:

**Additional context**