Test

Add Myst (new tech stack) workflow #121

Job	Run time
Build static site with tox	53s
tox on macos-latest with Python 3.12	57s
tox on ubuntu-latest with Python 3.11 and oldest versioned dependencies	57s
tox on ubuntu-latest with Python 3.12	1m 3s
Build and execute static site with myst	47s
Build static site with pixi	20s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	1m 23s
pixi on windows-latest with py312	26s
pixi on macos-latest with py311	13s
pixi on ubuntu-latest with py311	23s
pixi on windows-latest with py311	24s
pixi on ubuntu-latest with py312	22s
Build jupyterlite site with pixi	20s
pixi on macos-latest with py312	18s
tox on windows-latest with Python 3.12	1m 42s
	10m 28s

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