Extremely simple module to load a styleguide page.
All opinions about the styleguide are part of the twig template in the theme, which distinguishes it from other styleguide drupal modules.
If you create a library in your theme (THEMENAME.library.yml) called
ts_styleguide, it will be automatically loaded on your styleguide page.
Example:
ts_styleguide:
css:
theme:
assets/css/styleguide.css: {}