This new mode is supposed to absorb content that is currently added via --infile and recursive {=include=}
As we restructure the nixpkgs manual we are going to add pages to this file
As a result we end up with a config file that describes the sidebar structure and what files map to which entry
This is needed for 'docs.nixos.org' navigation cutover; which will consume this file along with the .md files and render it into the portal
