Allow users to set Kaleido path via environment variable #394

Job	Run time
Rustfmt	12s
semver	33s
Build Wasm Examples (wasm-yew-minimal)	46s
Clippy	3m 10s
Build Examples (3d_charts)	23s
Code Coverage	1m 59s
Build Examples (basic_charts)	22s
Tests (ubuntu-latest)	1m 28s
Build Examples (custom_controls)	25s
Tests (windows-latest)	3m 50s
Build Examples (financial_charts)	25s
Tests (macos-latest)	1m 37s
Build Examples (images)	40s
Build Examples (kaleido)	1m 8s
Build Examples (maps)	26s
Build Examples (ndarray)	27s
Build Examples (scientific_charts)	25s
Build Examples (shapes)	28s
Build Examples (subplots)	25s
	19m 9s

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