I prefer asciidoc to markdown. Asciidoc has actual standards for things. Antora will build a pretty nice site with your projects written in Asciidoc as well.
Ifyou just want a single page, Asciidoctor will build a site as well.
I had a look at asciidoc and it looks very nice, especially for larger documentation projects.
I have a couple projects in an Antora site. We had a ton more at work, but I can't show it on here. You can include multiple projects and have them appear at the bottom left, each with versions. We used it so that teams could create documentation for tools (or really whatever they wanted) and then that documentation could be scraped and included in the central site. I just have a few projects included in my site, but Antora makes that pretty easy.
Here's my very bad/basic example.