Allow users to set Kaleido path via environment variable #406

Job	Run time
semver	29s
Tests (ubuntu-latest)	2m 14s
Rustfmt	15s
Tests (windows-latest)	3m 40s
Build Examples (3d_charts)	23s
Build Wasm Examples (wasm-yew-minimal)	46s
Tests (macos-latest)	20m 32s
Build Examples (basic_charts)	25s
Clippy	2m 49s
Build Examples (custom_controls)	28s
Code Coverage	2m 0s
Build Examples (financial_charts)	24s
Build Examples (images)	41s
Build Examples (kaleido)	1m 10s
Build Examples (maps)	35s
Build Examples (ndarray)	29s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	26s
Build Examples (subplots)	25s
	38m 34s

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