Trying to create a dtdocs repository to prepare a pull request to supplement the rather spare existing documentation of the "custom sort" feature as described in my issue 672. Unfortunately, I have used git very little and am totally unfamiliar with hugo and yarn.

After cloning dtdocs repository and doing git submodule update --init --recursive, I find that there is no "install" file in .../docs-theme/assets or the .../docs-pdf-theme/assets. This of course kills the "yarn install" command as instructed in dtdocs README.md.

Trying to run hugo anyway, it goes nuts with lots of "execute of template failed: template: partials/css.html:4:16: executing "partials/css.html" at : can't evaluate field Sass in type interface {}."

I find the .../dtdocs/public directory still has usable HTML, but I presume that was already there in the cloned repository and hugo won't be able to update the HTML with my markdown editorial changes until I complete the prescribed yarn processing.

Where can I find the missing "install" file for yarn?

Also, I've read the wpferguson issue 101 thread, which mentions "extended" hugo. Is that also relevant to what I'm trying to do?