Comment by ksymph
I had that thought too. My own blogging engine is ~100 lines of lua that accomplishes the same as you describe, plus RSS, with one additional library for markdown parsing. The author mentions Mustache templates and WebMentions, but ten dependencies still seems like a lot; I wonder what they are.
The dependencies are
Many of the dependencies are there to support the posts that are legacy posts coming from my previous SSG. I imported them into the database and they require Yaml and other dynamic features. Some dependencies like gumbo, http, multipart are all there to support indieweb features such as webmentions and micropub.