Test

Add Myst (new tech stack) workflow #39

Job	Run time
tox on ubuntu-latest with Python 3.12	56s
tox on macos-latest with Python 3.12	44s
Build and execute static site with myst	44s
Build static site with pixi	29s
tox on windows-latest with Python 3.12	1m 44s
pixi on ubuntu-latest with py311	24s
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	41s
pixi on macos-latest with py311	30s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	1m 17s
pixi on macos-latest with py312	44s
pixi on windows-latest with py311	1m 28s
pixi on windows-latest with py312	1m 57s
	12m 37s

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