new mirror: USTC
bootstraps/archiso: automatically start ntpd
set some security sysctls

this is mostly nominal, extremely naive, but a start
[noaif] note things not done

these [noaif] commits will be a step-by-step dismantling of that stupid old AIF script, so that we may extract whatever it actually did that is still useful...
[noaif] remove mounting & fstab crap

pretty sure we don't need fstab anymore? idk
[noaif] hostname
[noaif] timezone
[noaif] root pw
[noaif] pacman

but keep the pkg lists
[noaif] ppz.conf
[noaif] networking
[noaif] initcpio
[noaif] boilerplate
[noaif] un-spacing
chromium uses ~/.cache not ~/cache
remove awful file syncing logic

all that stuff is provided in external packages now

set wallpaper with an envvar instead of weirdly clobbering a single file path