Test

Add Myst (new tech stack) workflow #34

Job	Run time
Build static site with pixi	27s
Build and execute static site with myst	46s
pixi on ubuntu-latest with py311	24s
pixi on ubuntu-latest with py312	20s
pixi on macos-latest with py311	47s
tox on ubuntu-latest with Python 3.12	47s
Build static site with tox	49s
pixi on macos-latest with py312	44s
tox on macos-latest with Python 3.12	39s
pixi on windows-latest with py311	1m 41s
tox on windows-latest with Python 3.12	1m 42s
pixi on windows-latest with py312	1m 30s
tox on ubuntu-latest with Python 3.11 and oldest versioned dependencies	44s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	1m 16s
	12m 36s

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