I’ve created a couple of minisites for key OS components, built using no frameworks, but plain CSS. Just having CSS grid and variables made it viable for me to avoid using frameworks recently. Having includes/imports one wouldn’t even need Jekyll.
The founding stone on all of these is the pixel art, which is now becoming my favorite art form.
If you maintain an upstream OS component and are looking to replace a wiki or a markdown readme with a simple site, I’ve created a template to get you started quickly.