Function sync_dir

perro_website/build.rs:200–206

(src: &Path, dst: &Path)

    }
    let Some(target_doc) = routes.get(path).copied() else {
        failures.push(format!(
            "{} links to missing route {path}",
            source.route_path
        ));
        return;
    };
    if let Some(fragment) = fragment {
        if !fragment.is_empty()
            && !target_doc
                .headings