Allow users to set Kaleido path via environment variable #412

Job	Run time
semver	38s
Clippy	3m 1s
Build Wasm Examples (wasm-yew-minimal)	54s
Build Examples (3d_charts)	22s
Code Coverage	2m 0s
Rustfmt	12s
Build Examples (basic_charts)	23s
Build Examples (custom_controls)	24s
Tests (ubuntu-latest)	1m 42s
Build Examples (financial_charts)	30s
Build Examples (images)	41s
Tests (windows-latest)	5m 3s
Build Examples (kaleido)	1m 26s
Tests (macos-latest)	2m 20s
Build Examples (maps)	30s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	28s
Build Examples (shapes)	23s
Build Examples (subplots)	23s
	21m 43s

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