Remove (temporarily?) retired AFL, pending okfn/licenses discussion.

Signed-off-by: enyst <engel.nyst@gmail.com>
Picked .md from okfn/opendefinition, licenses/conformant.

Signed-off-by: enyst <engel.nyst@gmail.com>
Removed licenses strictly not in the current OKFN list.

The removals include previous and next versions, even trivially
changed. (Presumably to be re-added on a case by case basis.)

Signed-off-by: enyst <engel.nyst@gmail.com>