docs: moved manpages to man, remove talks from repo

Talks can be found at: http://pub.netsniff-ng.org/paper/

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
make: minor: update comment

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Merge branch 'master' of git://github.com/borkmann/netsniff-ng