Completely refactor scripts.

Remove the 'root'/'external' distinction. This repository will now
include various scripts that I find useful in my Gentoo systems.
Encryption is just one of those things, and it should work on all
distributions, but other scripts will be tailored to Gentoo. The old
external encryption can still be obtained via the 'mount.sh' script.

Add scripts to install Gentoo system and a corresponding initramfs
'init' script. Remove old format/install scripts.