Allow users to set Kaleido path via environment variable #393

Job	Run time
Build Wasm Examples (wasm-yew-minimal)	55s
Clippy	37s
Code Coverage	2m 5s
Build Examples (3d_charts)	24s
Build Examples (basic_charts)	25s
Rustfmt	13s
semver	29s
Build Examples (custom_controls)	23s
Tests (ubuntu-latest)	1m 46s
Build Examples (financial_charts)	24s
Tests (windows-latest)	3m 0s
Build Examples (images)	36s
Tests (macos-latest)	1m 52s
Build Examples (kaleido)	1m 40s
Build Examples (maps)	23s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	29s
Build Examples (subplots)	22s
	16m 47s

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