switch to a workspace #103

Job	Run time
build (python, ubuntu-latest)	57s
build (jupyter, macos-latest)	2m 40s
build (rustjswasm, macos-latest)	10m 41s
build (js, macos-latest)	1m 22s
build (rust, macos-latest)	4m 37s
build (js, ubuntu-latest)	1m 12s
build (rustjswasm, ubuntu-latest)	7m 11s
build (python, macos-latest)	46s
build (rust, ubuntu-latest)	4m 36s
build (jupyter, ubuntu-latest)	1m 58s
	36m 0s

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