Allow folders to have top level main page#150

Right now a folder’s page only has the inferred strucure as it’s content. Often times it makes sense to treat this page as the main welcoming page for the section. I haven’t found a way to do that but it would be nice to be able to have a document instead of this automatic index created.

Thanks for raising this Ben.
I do have a solution almost ready for this, and a related ticket: https://ynaw.nolt.io/6

I’ll update when it’s ready!