Create or use a theme for docs.

Github info on themes... [https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/adding-a-theme-to-your-github-pages-site-using-jekyll](https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/adding-a-theme-to-your-github-pages-site-using-jekyll).

This could possibly work, or we can just use a custom HTML/JS/SASS theme for the documentation.