Remove 'docs/categories'.

This file is out-dated.
Merge branch 'master' of https://github.com/archey/blackarch into unstable
groups updated for lines 1-35 in 'docs/need-groups'
Merge branch 'master' of https://github.com/fnord0/blackarch into unstable

Conflicts:
	docs/need-groups
docs/need-groups: Remove cookie-cadger from 'wireless' group.
updated need-groups per fnord0 suggestions on irc