allow users to set Kaleido path via envionment variable #404

Job	Run time
Rustfmt	11s
Tests (ubuntu-latest)	1m 39s
Clippy	3m 6s
Tests (windows-latest)	4m 21s
Build Examples (3d_charts)	26s
Build Wasm Examples (wasm-yew-minimal)	47s
Tests (macos-latest)	7m 7s
Build Examples (basic_charts)	24s
Code Coverage	1m 43s
Build Examples (custom_controls)	22s
semver	31s
Build Examples (financial_charts)	25s
Build Examples (images)	44s
Build Examples (kaleido)	1m 34s
Build Examples (maps)	23s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	28s
Build Examples (shapes)	23s
Build Examples (subplots)	38s
	25m 35s

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