Config options for side panel visibility / size

**Is your feature request related to a problem? Please describe.**
I have recently updated from an older version and the "network" side panel has since been added (https://github.com/jesseduffield/lazydocker/pull/424).
I work on a quite small screen and am really only interested in the services, containers and images side panels.
In the past, the volumes side panel already "took away" some vertical space and now the networks section takes away even more.

**Describe the solution you'd like**
Option to hide specific side panels via the config file.

**Describe alternatives you've considered**
- Make the panel height configurable so that i can "clamp" the height of the network and volume panel to something very small and leave more room for the others.
- A more extreme version of the accordion effect (expandFocusedSidePanel) that makes unfocused side panels even smaller.