Help menu new arrangement

implement the new arrangement from https://groupes.renater.fr/wiki/txm-info/public/specs_menus#txm_081_stable

(from redmine: issue id 2846, created on 2020/06/08 by Matthieu Decorde)

added menu type::task + 1 deleted label

changed milestone to %TXM 0.8.1

closed

assigned to @mdecorde