Allow users to set Kaleido path via environment variable #410

Job	Run time
semver	37s
Clippy	3m 14s
Build Wasm Examples (wasm-yew-minimal)	54s
Build Examples (3d_charts)	24s
Code Coverage	2m 12s
Build Examples (basic_charts)	24s
Rustfmt	13s
Tests (ubuntu-latest)	2m 2s
Build Examples (custom_controls)	22s
Tests (windows-latest)	4m 22s
Build Examples (financial_charts)	27s
Tests (macos-latest)	10m 24s
Build Examples (images)	38s
Build Examples (kaleido)	1m 44s
Build Examples (maps)	21s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	24s
Build Examples (shapes)	26s
Build Examples (subplots)	22s
	29m 54s

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