configs: ditch.

This structure, i. e. "files to install to the newly installed system",
is migrated to arch-installer.
system/essential/verbatim-files: udev/rules.d/70-pm-usb-logitech.rules: ditch, site-specific.
system/essential/verbatim-files: issue, locale.conf: ditch, site-specific.
system/essential/verbatim-files: udev/rules.d: add 60-elevator.conf: default elevators for {,non}rotational devices.