optimisation(tests): remove Products.membrane profile, already applied
fix: remove icons when not authenticated
fix(group,delete): use a workflow action.

In Plone you can't delete a content if you don't have Delete objects
permission on the container...

I have tried collective.deletepermission addon without success, it
need fixes to works with dexterity.

So I have added transitions in all existing workflows on the setup
so every content which follow a workflow has delete and undo_delete
transitions.