Automatically generate TOC from folder structure

**DocFX Version Used**:
2.34
**Template used**: (`default` or `statictoc` or contain custom template)
default with small customizations

**Actual Behavior**:
Is it possible to have the toc automatically generated from the folder structure of my documentation? I have a lot of markdown documentation already organized in folders. I would like docfx to simply build a site that uses the existing organization as the toc. It seems like unnecessary busy work to have to add each of my markdown files to a toc file so that they are visible in the UI.