[Dev] ParabolaWiki installation guide

[bill-auger]

all i can say for certain about the install guide now, it that it
is in a state of flux because if the new 'base' meta-package

there are actually tree different install guides now - that
alone is confusing - we have not discussed it much; bit the
tendency seems to be toward one unified page and deleting the
other two - the main install guide now is essentially complete
for either systemd or openrc - that was not so just a few months
ago - for openrc, one needed to jump around between two articles
and important steps were often missed

as it is now, i dont think its too confusing - 95% of the
procedure is the same for either - there are only 2 (?)
sub-sections that differ depending on the initsystem - plus, the
latest goal is to normalize the base install process; by moving
all packages that are related to openrc into the [nonsystemd]
repo exclusively, all with identical names to their systemd
analogs - in that way, the install procedure would be even more
similar

much of the confusion now is due to the package names and
conflicts with providers of elogind, libsystemd and other
init-specific essentials - for example, ideally one would only
need to enable [nonsystemd] and pacman -Syyuu to migrate from
systemd to openrc; or disable [nonsystemd] and pacman -Syyuu to
migrate from openrc to systemd