Test

BUG: fix shell syntax #92

Job	Run time
Build static site with tox	41s
Build jupyterlite site with pixi	47s
Build static site with pixi	30s
pixi on ubuntu-latest with py311	26s
tox on ubuntu-latest with Python 3.12	42s
pixi on ubuntu-latest with py312	26s
tox on macos-latest with Python 3.12	52s
pixi on macos-latest with py311	1m 5s
tox on windows-latest with Python 3.12	1m 24s
pixi on macos-latest with py312	44s
tox on ubuntu-latest with Python 3.11 and oldest versioned dependencies	42s
pixi on windows-latest with py311	1m 44s
tox on ubuntu-latest with Python 3.13 and developer versioned dependencies	1m 5s
pixi on windows-latest with py312	2m 14s
	13m 22s

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