Initial build on Netlify fails when zipping results

I forked, adjusted the sites and the initial build on Netlify failed with this in the "Building" phase:

`Error: Command failed: zip -r -y /opt/build/repo/_site/results.zip results`

Simply adding `_data/results/.gitkeep` to the repo fixed it.

Not sure if that's just happening to me… 🤷‍♂️