clean up design

app.py

@@ -33,7 +33,7 @@ def _build_header_markdown(doc) -> str:
         parts.append(f"**Wikidata ID**: {wikidata_id}")
     header = "  |  ".join(parts)
     if url:
-        header += f"\n[{url}]({url})"
+        header += f"\n\n[{url}]({url})"
     return header
 def matches_filters(doc, require_has_math: bool | None, require_has_infobox: bool | None) -> bool:
     meta = doc.metadata or {}