{%- assign site_pages = site.html_pages
    | sort: "path"
    | sort: "sort"
    | where_exp: "item", "item.url != '/404.html'"
    | where_exp: "item", "item.url != '/search.html'" -%}

{%- assign site_dirs  = site_pages | where_exp: "item", "item.dir == item.url" -%}
{%- assign site_files = site_pages | where_exp: "item", "item.dir != item.url" -%}