Allow users to set Kaleido path via environment variable #405

Job	Run time
semver	29s
Clippy	2m 51s
Build Wasm Examples (wasm-yew-minimal)	46s
Build Examples (3d_charts)	23s
Build Examples (basic_charts)	24s
Code Coverage	1m 58s
Rustfmt	14s
Build Examples (custom_controls)	23s
Tests (ubuntu-latest)	1m 51s
Build Examples (financial_charts)	24s
Tests (windows-latest)	3m 34s
Build Examples (images)	43s
Tests (macos-latest)	6m 17s
Build Examples (kaleido)	1m 16s
Build Examples (maps)	27s
Build Examples (ndarray)	25s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	25s
Build Examples (subplots)	22s
	23m 33s

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