Allow users to set Kaleido path via environment variable #388

Job	Run time
Code Coverage	1m 59s
Clippy	3m 5s
Build Examples (3d_charts)	33s
Build Wasm Examples (wasm-yew-minimal)	53s
Build Examples (basic_charts)	25s
Rustfmt	12s
Build Examples (custom_controls)	23s
semver	40s
Tests (ubuntu-latest)	1m 58s
Build Examples (financial_charts)	26s
Tests (windows-latest)	4m 7s
Build Examples (images)	37s
Tests (macos-latest)	2m 19s
Build Examples (kaleido)	1m 19s
Build Examples (maps)	31s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	26s
Build Examples (shapes)	24s
Build Examples (subplots)	28s
	21m 9s

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