Ignore superpowers directory #248

Job	Run time
build (js, ubuntu-latest)	1m 25s
build (jupyter, macos-latest)	2m 10s
build (cpp, macos-latest)	1m 41s
build (python, ubuntu-latest)	41s
build (python, macos-latest)	45s
build (cpp, ubuntu-latest)	3m 59s
build (js, macos-latest)	1m 24s
build (rustjswasm, ubuntu-latest)	7m 47s
build (jupyter, ubuntu-latest)	1m 57s
build (cppjswasm, macos-latest)	3m 3s
build (rust, macos-latest)	5m 34s
build (rust, ubuntu-latest)	5m 37s
build (cppjswasm, ubuntu-latest)	2m 8s
build (rustjswasm, macos-latest)	9m 10s
	47m 21s

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