Jupyter Lab: use markdown as its storage format

[lamyergeier]

From your Readme.md

Editing in the browser (new!)
You can configure IPython / Jupyter to seamlessly use markdown as its storage format. Add the following to your config file:

c.NotebookApp.contents_manager_class = 'notedown.NotedownContentsManager'
Now you can edit your markdown files in the browser, execute code, create plots - all stored in markdown!

For Jupyter, your config file is jupyter_notebook_config.py in ~/.jupyter.

For Jupyter lab:

jupyter-lab --generate-config

The method you provided works nicely with jupyter notebook, but is not working like that for Jupyter lab.
Could you please extend the support to Jupyter-lab.

[grst]

Depends on jupyterlab/jupyterlab#4924.

[grst]

Fixed in the latest development version of jupyter.
There is now a 'Notebook' entry in the 'Open With' context menu for such notebooks.