Something I noticed deploying to GitHub pages is that the _next folder is by default not served by GitHub (404s) as mentioned here (underscored folders are ignored): https://github.com/blog/572-bypassing-jekyll-on-github-pages

Would it be possible for the _next folder to not begin with an underscore, or instead to add a note to the README mentioning this behaviour and the fact you need to add a blank .nojekyll file to the out dir otherwise?