[jama_]

Looks like a repurposed VitePress docs template, which is a perfectly fine solution for text-heavy content. The site appears to be open-source, there are links to the repo at the bottom of each page: https://github.com/xiaoiver/infinite-canvas-tutorial

[xiaoiver]

I'm using vitepress which has a lot of built-in markdown extensions. https://vitepress.dev/guide/markdown