The [url dev.lino-framework.org/dev/lets/index.html LETS tutorial] uses a separate [url gitlab.com/lino-framework/lets/ lets repository], which uses multiple branches (step2, step3, step4 etc) in order to visualize different development steps. But this approach is difficult to maintain and adds useless complexity. We should review the LETS tutorial to use a normal demo project, or multiple demo projects lets1, lets2, etc)