static files: &[(&[&str], &[&str])] = &[
    (&["core"], &["core", "index.html"]),
    (&["core::arch"], &["core", "core/arch/index.html"]),
    (&["fn"], &["std", "keyword.fn.html"]),
    (&["std::fs"], &["std", "fs", "index.html"]),
];