Glancing at the Gemfile, it's a Jekyll system. That's a Ruby package that does all the markdown to markup conversion.
This seems like relevant documentation: https://www.netlify.com/blog/2020/04/02/a-step-by-step-guide...
This seems like relevant documentation: https://www.netlify.com/blog/2020/04/02/a-step-by-step-guide...
You know, it seems easier to just write the thing for something so simple... otherwise we have to now keep track of ruby and gems and such. I mean, it is one more thing for a simple blog, right?