Allow users to set Kaleido path via environment variable #408

Job	Run time
Clippy	3m 18s
semver	32s
Tests (ubuntu-latest)	1m 43s
Tests (windows-latest)	4m 48s
Build Examples (3d_charts)	24s
Build Wasm Examples (wasm-yew-minimal)	55s
Build Examples (basic_charts)	25s
Tests (macos-latest)	1m 59s
Code Coverage	2m 14s
Build Examples (custom_controls)	23s
Rustfmt	14s
Build Examples (financial_charts)	28s
Build Examples (images)	37s
Build Examples (kaleido)	1m 39s
Build Examples (maps)	25s
Build Examples (ndarray)	30s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	25s
Build Examples (subplots)	22s
	21m 44s

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