Leave metaformat item out of representative feed

         items = _get_all_items(mf2json, ["h-entry", "h-event"])
     feed["items"] = []
     for item in items:
+        if item.get("source") == "metaformats":
+            continue
         item["properties"]["type"] = item["type"]
         feed["items"].append(item["properties"])
     if rel_next := mf2json["rels"].get("next"):