Sync network panels with upstream
I didn't want to clutter #122 so lets have a different issue:
Looking at https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/583#note_671959 which links to https://gitlab.gnome.org/Teams/Design/settings-mockups/blob/master/shell/settings-cleanup.png what we're doing downstream is different from the upstream designs (which use a single panel) and has a WIP MR here https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/680
@tobias.bernard is the design linked there still the relevant one? It would be good to work in the same direction as uptream for byzantium here since g-c-c is one of the more tricky components to backport over and over since it hooks into lots of places like g-s-d, shell, ...