[pkg-apparmor] Bug#874873: Pick the best AppArmor introduction docs and advertise them better

[intrigeri at debian.org]

Package: apparmor
Version: 2.11.0-10
Severity: important
X-Debbugs-Cc: Christian Seiler <christian at iwakd.de>

Christian Seiler wondered [1] if we have good documentation for
AppArmor beginners.

We should evaluate the various options listed on our wiki [2], pick
the best one for each of our target audiences, remove the worst ones,
clarify who the target audience is for each remaining link, and
advertise the best pieces of doc the best we can, starting with our
wiki and /usr/share/doc/apparmor/README.Debian.

Tentative relevant target audiences:

 * not very technical Debian desktop users who hit problems with
   AppArmor
 * system administrators who hit problems with AppArmor
 * developers & system administrators who want to start using AppArmor
   to confine the software they write/run

[1] https://lists.debian.org/debian-devel/2017/08/msg00256.html
[2] https://wiki.debian.org/AppArmor#External_links