A No-Build Markdown Site for Study Notes (or any docs)

I needed a way to study a stack of notes I had written for a job interview. Eight markdown files, plus some code examples, plus a couple of reference pages. I wanted to read them in a browser with a sidebar, dark mode, and clickable navigation between files. But I did not want to install a static site generator, run a dev server, or maintain a build pipeline for what is basically a personal study folder. So I built a single-page viewer in one HTML file that reads the markdown directly. The whole