ENH: implement RTD config for `pixi+uv` #857

Job	Run time
pytest / Determine job matrix	9s
style / Determine skipped pre-commit hooks	9s
doc / linkcheck / Check external links	27s
doc / nb / Execute and build documentation	25s
style / Run local pre-commit hooks	40s
style / Run taplo through pre-commit	0s
pytest / Run unit tests (3.10, ubuntu-24.04)	25s
pytest / Run unit tests (3.11, ubuntu-24.04)	15s
pytest / Run unit tests (3.9, ubuntu-24.04)	13s
pytest / Run unit tests (3.12, ubuntu-24.04, compwa_policy)	23s
pytest / Run unit tests (3.9, macos-14)	21s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	3m 27s

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