Allow users to set Kaleido path via environment variable #397

Job	Run time
semver	29s
Tests (ubuntu-latest)	1m 55s
Tests (windows-latest)	4m 43s
Clippy	3m 0s
Build Examples (3d_charts)	25s
Code Coverage	1m 51s
Build Examples (basic_charts)	25s
Rustfmt	11s
Tests (macos-latest)	10m 47s
Build Examples (custom_controls)	24s
Build Examples (financial_charts)	47s
Build Wasm Examples (wasm-yew-minimal)	47s
Build Examples (images)	41s
Build Examples (kaleido)	1m 14s
Build Examples (maps)	42s
Build Examples (ndarray)	29s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	32s
Build Examples (subplots)	22s
	30m 7s

Provide feedback