Test

Add Myst (new tech stack) workflow #120

Job	Run time
Build static site with tox	46s
tox on windows-latest with Python 3.12	1m 27s
tox on ubuntu-latest with Python 3.12	57s
tox on ubuntu-latest with Python 3.11 and oldest versioned dependencies	53s
tox on macos-latest with Python 3.12	1m 12s
pixi on ubuntu-latest with py311	21s
Build static site with pixi	19s
Build jupyterlite site with pixi	21s
pixi on macos-latest with py311	20s
pixi on windows-latest with py312	22s
pixi on macos-latest with py312	20s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	1m 30s
pixi on windows-latest with py311	24s
Build and execute static site with myst	59s
pixi on ubuntu-latest with py312	21s
	10m 32s

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