TutteInstitute/datamapplot

AI Summary: The task is to modify the `datamapplot` library to allow the `logo` parameter in the plotting functions to accept a local file path (using a `file://` URL) in addition to a URL. This involves adding logic to detect the file path, using `urllib` to read the local image, converting it to base64, and integrating it into the existing plotting process. Testing will be required to ensure the functionality works correctly with both local and remote logos.