https://publii.ticksy.com/ticket/1216232/
From Bob:
"We still preparing the dev documentation and I think it will be ready this holiday. Right now you can browse the themes packages and see how they are built. Below you can download the .pdf with handlebars tags used in Publii themes.
https://drive.google.com/file/d/0B92PpHk85ShpZk50NVFVQlZjX3c...
Referring to repository question, we will need to reflect further on this matter, but probably the GitHub is the best solution for that."