Update pyproject.toml to automatically enable "Deploy as" option

[tdpetrou]

I finally had a chance to look at pyproject.toml and noticed that there is no instruction to automatically copy jupyter-config/nbconfig/notebook.d/jupyter_to_medium.json into the local user directoryetc/jupyter/nbconfig/notebook.d during installation. This enables the "File -> Deploy as" dropdown menu option in the notebook.

Currently, users will need to run jupyter bundlerextension enable --py jupyter_to_medium._bundler --sys-prefix in order to get this option to appear.

With the old setup.py packaging scipt, this was accomplished through the use of data_files. See the examples in the Jupyter notebook documentation here.

Briefly looking at poetry, It doesn't appear that there is support for it. A long discussion can be seen here.

@spoorn created poeblix, a poetry plugin for this exact case.

Any thoughts @mjam03 ?