Fix glob to recursive

Search for *.md files recursively in the base_path directory.

src/core/utils.py

@@ -331,7 +331,7 @@ class GitRepo:
         :return: a dictionary mapping filenames to that file's text content
         """
         documents = {}
-        for file in self.base_path.glob(glob):
+        for file in self.base_path.rglob(glob):
             # we are only interested in actual files
             if not file.is_file():
                 continue