Allow users to set Kaleido path via environment variable #400

Job	Run time
Clippy	3m 3s
Build Wasm Examples (wasm-yew-minimal)	51s
Build Examples (3d_charts)	26s
Code Coverage	2m 4s
Build Examples (basic_charts)	23s
Rustfmt	15s
semver	40s
Build Examples (custom_controls)	29s
Tests (ubuntu-latest)	1m 54s
Build Examples (financial_charts)	34s
Tests (windows-latest)	4m 38s
Build Examples (images)	37s
Tests (macos-latest)	1m 50s
Build Examples (kaleido)	1m 11s
Build Examples (maps)	25s
Build Examples (ndarray)	22s
Build Examples (scientific_charts)	37s
Build Examples (shapes)	24s
Build Examples (subplots)	21s
	21m 4s

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