It’s a theme for Hugo.

https://themes.gohugo.io/themes/hugo-theme-terminal/

Actually I am using Zola, not Hugo, but the theme I am using is modified port of Terminal.

Ah. I used to use Zola but I migrated to Hugo myself.

I thought the same. The typography, colors, layout, and restraint are gorgeous.

I was about to post a comment to the same effect, but it's better to piggy-back on yours and avoid polluting the thread.

I find the design incredibly charming !