Allow users to set Kaleido path via environment variable #402

Job	Run time
semver	34s
Clippy	30s
Tests (ubuntu-latest)	1m 33s
Rustfmt	13s
Tests (windows-latest)	3m 47s
Tests (macos-latest)	11m 4s
Build Wasm Examples (wasm-yew-minimal)	50s
Code Coverage	1m 43s
Build Examples (3d_charts)	34s
Build Examples (basic_charts)	25s
Build Examples (custom_controls)	25s
Build Examples (financial_charts)	23s
Build Examples (images)	36s
Build Examples (kaleido)	1m 27s
Build Examples (maps)	21s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	37s
Build Examples (subplots)	22s
	26m 8s

Provide feedback