Pixi CI Workflow

Remove mambaforge install instructions and refer users to miniforge instead #111

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Run time

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Job	Run time
[pixi:ubuntu-22.04]	51m 34s
[pixi:macos-13]	1h 2m 5s
[pixi:macos-14]	42m 26s
[pixi:windows-2019]	1h 3m 51s
	3h 39m 56s