Link to https://jupyter.readthedocs.io documentation is broken... Please remove or update.

In this github main documentation the following link to `Usage` documentation is broken.  (see link below).

Please remove it or fix it.  I cannot find the page to which it points.

# Usage

Add snippets in [jupyter_data_dir]/snippets (see: https://jupyter.readthedocs.io/en/latest/projects/jupyter-directories.html#id2)
