Fix link order (#92)

Author: brichet

gluepyter/glue_ydoc.py

@@ -260,3 +260,4 @@ def add_links_to_contents(self, links: Dict[str, Dict], contents: Dict):
                     link[f"cids{i}"] = list_name
             contents[link_name] = link
             contents[self._data_collection_name]["links"].append(link_name)
+        contents[self._data_collection_name]["links"].sort()