Test

Add Myst (new tech stack) workflow #42

Job	Run time
pixi on ubuntu-latest with py311	21s
Build static site with tox	40s
pixi on ubuntu-latest with py312	23s
Build static site with pixi	30s
Build and execute static site with myst	38s
pixi on macos-latest with py311	37s
pixi on macos-latest with py312	27s
tox on ubuntu-latest with Python 3.12	50s
tox on macos-latest with Python 3.12	55s
pixi on windows-latest with py311	1m 50s
tox on windows-latest with Python 3.12	1m 52s
pixi on windows-latest with py312	2m 15s
tox on ubuntu-latest with Python 3.11 and oldest versioned dependencies	39s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	1m 12s
	13m 9s

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