Slightly tangential, but I really love the minimal but effective site design here. It is minimal, responsive and easy to read. Is this a theme or just the author being very effective and throwing together a documentation site?
It is also all custom: https://github.com/esbuild/esbuild.github.io. YAML files that get converted to plain static HTML pages. It's designed to work well without any JavaScript. Even the animated graphs on the home page are done without JavaScript.
