AppArmor profile for qutebrowser

I know it has architecture-specific stuff in it ("x86_64"), but hey, it's a start.

Created a dir "contrib", as seen in https://github.com/cjdelisle/cjdns/tree/master/contrib/apparmor
Hmm, what part of proc is really needed? I *think* a process can read quite a bit in `/proc` it doesn't necessarely need to, but I don't know exactly.