Mind blowing to me is the fact that there's no database, no underlying CMS, no logins, no real application code from what I can see. A single gem rebuilds the site, when I ask I it, dumps everything into a public folder all neat an tidy like, and that's it. I run it locally to test my updates, push it to GitHub, then push it to Heroku. Yeah it's fiddly. Yeah I need to automate a few things to speed up post creation but that's possibly a good thing: I'm thinking more about words and metadata, less about post mass and volume. Bonus points for iA Writer becoming my best new favourite CMS.
It's time to rebuild your website and ditch that database for good.