Test

Add Myst (new tech stack) workflow #35

Job	Run time
tox on ubuntu-latest with Python 3.12	45s
tox on macos-latest with Python 3.12	33s
Build static site with pixi	29s
tox on windows-latest with Python 3.12	1m 31s
Build and execute static site with myst	38s
pixi on ubuntu-latest with py311	21s
tox on ubuntu-latest with Python 3.11 and oldest versioned dependencies	38s
pixi on ubuntu-latest with py312	21s
Build static site with tox	46s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	51s
pixi on macos-latest with py311	42s
pixi on macos-latest with py312	30s
pixi on windows-latest with py311	1m 45s
pixi on windows-latest with py312	1m 19s
	11m 9s

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