I always thought the documentation generator sites had excellent demos for this kind of thing, e.g. https://docsify.js.org/ https://docsify.js.org/ and https://

I always thought the documentation generator sites had excellent demos for this kind of thing, e.g. https://docsify.js.org/ https://docsify.js.org/ and https://docusaurus.io/docs https://docusaurus.io/docs (Fortunately they are designed to be customized so you can shape things up as you please, as well)