Mysterious style.css generation

[tofu-rocketry]

When Jekyll generates the site, something seems to be auto generating _site/assests/css/style.css that contains v4.1.1 of "normalized.css". If we have our own assets/css/style.css, it gets overwritten (hence the need to move it in #16).

First line of the interloping style.css:

/*! normalize.css v4.1.1 | MIT License | github.com/necolas/normalize.css */

I can't find any reference to this file in our files, but it does seem to be something to do with our particular set up. Found one other person that may have had the issue here.