Mine uses Jekyll with a heavily customized Just-the-Docs theme. The other notable technology used on it is KaTeX, which I use to pre-render all the math formulas to HTML when generating the site.

I have not updated my website in 2 years but wrote one.

https://geekodour.org/docs/colophon/

looking back I do feel i've been oversharing things but here goes nothing.

No, I don't even have a footer on my website.

Mine's here: https://twomorecents.org/tech-stack.html

My “about” page has sections about all that: https://lee-phillips.org/about/