Updated documentation of WLAN setup on ubuntu 20.04
Updated documentation of WLAN setup on ubuntu 20.04

uses netplan, so if-up.d scripts need to be applied in /etc/networkd-dispatcher/routable.d, see: https://netplan.io/faq/
uses systemd-resolved, so need to add output-interface to FORWARD & POSTROUTING rules https://www.reddit.com/r/linuxadmin/comments/g935ki/systemdresolved_and_iptables_masquerading/
alexreinert/piVCCU,alexreinert/piVCCU,alexreinert/piVCCU