We recently needed to rebuild our documentation site, currently built using Jekyll hosted on GitHub Pages. We wanted to update the content and refresh the style to make it easier to find answers.
We considered hosted services that could accept our markdown content, like ReadMe.io and Read the Docs, however both seemed expensive for essentially hosting the same platform we already had for free.
I also looked at the Gatsby Static Site generator to modernize Jekyll. I don't think this is a fit, as our documentation is relatively simple and relies heavily on Markdown. Jekyll excels at Markdown, while Gatsby seemed to struggle with it.