This removes the manual modules that use options to activate hardware
configuration. It seems to general (e.g. newer Intel GPUs require
different opencl icd) or not flexible enough (in case of the ssd
module).
Closes#21.
This avoids surprises when nixos-generate-config is used on a running
system and an overlayfs for docker that is unavailable in stage 1 is
added to /etc/fstab (because it forces me to read what was changed).
Simon Bruder