It is now possible to completely bypass Jekyll processing on GitHub Pages by creating a file named .nojekyll in the
root of your pages repo and pushing it to GitHub. This should only be necessary if your site uses files or directories
that start with underscores since Jekyll considers these to be special resources and does not copy them to the final
site.

https://github.blog/2009-12-29-bypassing-jekyll-on-github-pages/