So I have a docfx.json which is configured correctly and targets the correct directories. What I'm wondering is how can I generate site using that docfx.json from scratch.
E.g. I have a blank directory with just the docfx.json in it and want to generate all the site and documentation using that docfx.json.
Like using the docfx init command but instead of generating a blank site I generate the site using the existing docfx.json.
You need to manually do the setup yourself. See more info on how to do that here