I don't know what this is for; I think it has something to do with
containers, possibly for `systemd-npsawn`? It spawns a bunch of
processes and wastes several megabytes of RAM.
We need the Broadcom firmware from the _linux-firmware_ package (and
nothing else). We also need _wpa_supplicant_, to configure the WiFi
connection. Finally, we need to configure _systemd-networkd_ to manage
the network device.