Display content for folder items#277

I would like to be able to display the contents of a doc when a folder is selected, rather than simply a list of the folder’s contents (see image). Maybe if there’s a doc with the same name next to the folder, we could view the contents of that doc instead of the file list.

Extra nice if I could add some sort of {​{​TOC}} placeholder in the doc to indicate where to display the folder contents.