fix: make the content file filter more strict to prevent possible issues

        if len(self.content_files) != 0:

            return self.content_files

        content_prefix = settings.DEFINITION_CONTENT_STORAGE + "/"

        for info in self._definition.infolist():

            if info.is_dir() or not info.filename.startswith(

                settings.DEFINITION_CONTENT_STORAGE

            if (

                info.is_dir()

                or not info.filename.startswith(content_prefix)

                or not info.filename.endswith(".md")

            ):

                continue