BUG: missing save-as Myst Markdown option
Description
There should be an easy way to save a notebook (usually started its life in ipynb format) as a MyST markdown. Currently it's only possible to either start as one, or to jupytext convert on the command line (which then will lack the metadata header; at least when converted from vanilla markdown).
Proposed solution
Add a "MyST Markdown" option to the "File"--> "Save and Export Notebook as"
Additional notes
jupyterlab-myst 2.4.2 is installed when I made the screenshot
There is another tool which does exactly this, and that is jupytext. See:
https://jupytext.readthedocs.io/en/latest/#paired-notebooks
As I understand, this extension is solely meant to preview the web rendering of the markup.
Thanks. I'm familiar with jupytext, and not at all interested in the pairing feature. This feature would fit nicely into this extension and is something that I feel strongly about that we (JB/mystmd) should provide support for, but I would not be against a more upstream support either.