I assume there's probably a way to modify or configure MD-based SSGs to produce side notes instead of footnotes. Hilariously I think you could use RMD because t

I assume there's probably a way to modify or configure MD-based SSGs to produce side notes instead of footnotes. Hilariously I think you could use RMD because that has built-in sidenote functionality but it would probably require some manual effort to produce those nice highlights. That said, Molly is also making use of footnotes inside her margin notes, so if that's the goal my suggestions might not work.