Allow users to set Kaleido path via environment variable #395

Job	Run time
Clippy	3m 11s
Code Coverage	1m 52s
Build Examples (3d_charts)	27s
Build Wasm Examples (wasm-yew-minimal)	48s
Build Examples (basic_charts)	28s
Rustfmt	12s
semver	28s
Build Examples (custom_controls)	31s
Tests (ubuntu-latest)	1m 33s
Build Examples (financial_charts)	27s
Tests (windows-latest)	3m 32s
Build Examples (images)	38s
Build Examples (kaleido)	1m 18s
Build Examples (maps)	27s
Tests (macos-latest)	2m 0s
Build Examples (ndarray)	27s
Build Examples (scientific_charts)	26s
Build Examples (shapes)	25s
Build Examples (subplots)	25s
	19m 35s

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