Instead of manually setting the DPI to 192 or other values, we can
just take the value from xrdb instead.
This script, in combination with GTK's settings.ini if you are in a
non-GNOME environment, is everything you need to launch both GTK and
Qt applications at the appropriate DPI, with their respective themes
applied as well.
It turns out that placing similar config files (i.e. bspwm-related) in
the same directory is not the way to go about handling dotfiles since
each config file (or dotfile) *should* manipulate only a single program.
This was not the case back when I used urxvt (which would require the
old method of .Xresources), but now that I understand more about how
*modern* dotfiles work (with $XDG_CONFIG_HOME), separating dotfiles by
program became the obvious choice.
