Function collect_demo_doc

perro_website/build.rs:238–243

(root: &Path, slug: &str, path: &Path, out: &mut Vec<DocOut>)

                .with_web_output_dir(WebOutputDir::Build),
        )
        .map_err(|err| io::Error::other(format!("{project_name} web build failed: {err}")))?;
    }

    if bundle_complete(&output_dir) {
        sync_dir(&output_dir, &public_dir)?;
    }
    Ok(())
}