This is not really comparable to Docusaurus: your thing is a little toy to publish documentation online but not really useful to create a great advanced and looking doc site.

Just consider this: your tool requires client-side JS to work. This is very inaccessible and does not respect the progressive enhancement philosophy of the web. A Docusaurus site takes great care of accessibility, and the experience with JS disabled remains good.

Also using JS this way with anchor link routing will likely lead to bad SEO, and a flash of unstyled content which gives a really bad UX.