Directly editing the style.scss in `/css` does not regenerate `_site/css/style.css`

[brianbancroft]

Hi there,

I've been attempting to lightly modify your Jekyll theme, and have run into errors when I try to change the Style.

When I save ./css/style.scss after changing any of its attributes, it removes _site/css/style.css and adds ./_site/css/style.scss in its place. The two sass files are the same.

Without a style.css, the app renders as raw HTML without style. This is why this becomes a problem.

I am using Jekyll 3.3.1 and ruby 2.4.0.

Would you have any idea of what could be causing this? I'm junior at this game, but I'd be happy to make this a PR with a bit of guidance on how to hunt down this bug.