Add isoforms

Add an Isoforms field on guide page to show links to guides which are isoforms of the current guide.

changed milestone to %Livrable 1

added Todo enhancement + 1 deleted label

assigned to @julien.touchais

changed the description

added Doing label and removed Todo label

created branch 49-add-isoforms to address this issue

mentioned in merge request !16 (merged)

added #57 (closed) as child task

added #58 (closed) as child task

added #59 as child task

added Done label and removed Doing label

closed

removed Done label

added Done label