Allow users to set Kaleido path via environment variable #403

Job	Run time
Rustfmt	15s
semver	37s
Clippy	3m 12s
Build Examples (3d_charts)	24s
Build Wasm Examples (wasm-yew-minimal)	49s
Code Coverage	1m 54s
Build Examples (basic_charts)	27s
Tests (ubuntu-latest)	2m 3s
Build Examples (custom_controls)	29s
Tests (windows-latest)	4m 25s
Build Examples (financial_charts)	25s
Tests (macos-latest)	1m 49s
Build Examples (images)	38s
Build Examples (kaleido)	1m 34s
Build Examples (maps)	21s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	28s
Build Examples (shapes)	34s
Build Examples (subplots)	29s
	21m 16s

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