Distinguish attachments, which are non-markdown files that should be served/copied directly, not processed into a template.

src/main.rs

@@ -35,6 +35,8 @@ async fn page<'r>(
     let path_str = path.to_str().unwrap();
     if let Some(resource_path) = renderer.resolve_to_resource(path_str) {
         Some(PageResponder::File(NamedFile::open(resource_path).await.unwrap()))
+    } else if let Some(attachment_path) = historian.resolve_to_attachment(path_str) {
+        Some(PageResponder::File(NamedFile::open(attachment_path).await.unwrap()))
     } else {
         historian.resolve_to_page(path_str).map(|page| {
             if let Some(query) = origin.query() {