feat: LXC docs, base LXC, use NixOS LXC module

feat: cadvisor

feat: small tweak to util ip mapping

feat: pass lib to artautil, rename hostnameToIPv4

feat(systems/profiles/lxc): set timezone

fix(roles/prometheus): mkIf enable

feat: rest of lxc common, working dns configuration

wip: lxc stuff