Allow users to set Kaleido path via environment variable #409

Job	Run time
Code Coverage	2m 17s
Build Examples (3d_charts)	25s
Clippy	3m 14s
Build Wasm Examples (wasm-yew-minimal)	45s
Build Examples (basic_charts)	26s
Build Examples (custom_controls)	22s
Rustfmt	11s
semver	44s
Build Examples (financial_charts)	26s
Tests (ubuntu-latest)	2m 13s
Build Examples (images)	41s
Tests (windows-latest)	4m 19s
Build Examples (kaleido)	1m 18s
Tests (macos-latest)	1m 50s
Build Examples (maps)	33s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	26s
Build Examples (shapes)	29s
Build Examples (subplots)	23s
	21m 25s

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