install-deps: Use pacman instead of yaourt.
list: Remove pointless subshells.

Bash makes subshells when piping to loops anyways.
Remove 'Maintainer' comments from all BlackArch PKGBUILD files.
Remove 'install-deps' script.

There's no need for it.
prep-packages: Fix the comments at the top.
Merge 'new-packages' into 'packages'. Remove 'categories'.
Add a CONTRIBUTING file. Remove the archtrack one.