MyST Notebook should appear as an option(s) in the Launcher

[stevejpurves]

Context

Currently the launcher only allows normal notebooks to be launched. So when creating a new notebook, it will be opened with the normal renderer. A user has to close the notebook and reopen it for it to be rendered with myst

Proposal

Add a MyST Notebook section to the launcher!

Tasks and updates

No response

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[agoose77]

Can this be closed, now that we support JupyText?

[rowanc1]

Yeah, and that it is now the default renderer, I think this is no longer necessary.