Extinguish EntityRole and EntityLink

https://redmine.teklia.com/issues/5980

Requires backend#1723 (closed)

The EntityRole and EntityLink models should be removed, and the export version needs to be updated.

changed milestone to %Arkindex 1.6.0

added P3 Quick Win Tech debt labels

marked this issue as related to doc#91 (closed)

marked this issue as related to backend#1723 (closed)

marked this issue as related to frontend#1392 (closed)

changed milestone to %Arkindex 1.6.1

assigned to @mlbonhomme

mentioned in merge request !14 (merged)

closed with merge request !14 (merged)