Allow users to set Kaleido path via environment variable #396

Job	Run time
Rustfmt	13s
semver	34s
Build Wasm Examples (wasm-yew-minimal)	48s
Build Examples (3d_charts)	31s
Clippy	2m 55s
Code Coverage	1m 51s
Build Examples (basic_charts)	30s
Tests (ubuntu-latest)	1m 56s
Build Examples (custom_controls)	27s
Tests (windows-latest)	3m 59s
Tests (macos-latest)	1m 53s
Build Examples (financial_charts)	23s
Build Examples (images)	36s
Build Examples (kaleido)	1m 17s
Build Examples (maps)	25s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	26s
Build Examples (subplots)	23s
	19m 54s

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