pikaur can run as root

[kousu]

When I first wrote this up a big part of the trouble was setting up. But at some point this year pikaur started using some new feature (of systemd?) where it can spawn a new user in a new container temporarily. To do that the first thing it does now is run sudo to ask for root, whereas before it had to first download and build everything as the calling user, and only ran sudo for sudo pacman -U.

This means that most of the instructions here should be replaceable with just

# /etc/cron.d/automatic-upgrades
@daily   root    pikaur -Syu --noconfirm

Test this, if so, update the guide and archive this repo I guess?