`__main__.html` 404 on website

[YDX-2147483647]

https://metaist.github.io/pdfmerge/__main__.html

__main__.html exists, and I can preview it, but GitHub says 404.

I guess some configuration is outdated, could you fix that? Thanks!

Update

I've tried a local jekyll build. The __main__.html is ignored by Jekyll.

./
├── _site/
│   └── index.html*
├── __main__.html*
└── index.html*