Thanks guys.
- The main index of site is handled by
/layouts/index.html. - The blog layout is handled by
/layouts/_default/list.htmland contents are grabed from files in/contents/blog/post-*.md.
It has implemented what I was asking for. Please read this comment if you want to have a site with an index and a blog.
Now, the only remained problem: post URLs are lack of date. It was expected for [DOMAIN]/blog/2017/12/post-A.html, but I get: [DOMAIN]/blog/post-A.html.