Allow users to set Kaleido path via environment variable #399

Job	Run time
semver	32s
Rustfmt	12s
Clippy	5m 2s
Code Coverage	2m 14s
Build Wasm Examples (wasm-yew-minimal)	56s
Build Examples (3d_charts)	23s
Build Examples (basic_charts)	27s
Tests (ubuntu-latest)	1m 56s
Build Examples (custom_controls)	23s
Tests (windows-latest)	3m 38s
Build Examples (financial_charts)	24s
Build Examples (images)	38s
Tests (macos-latest)	2m 1s
Build Examples (kaleido)	1m 37s
Build Examples (maps)	23s
Build Examples (ndarray)	31s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	30s
Build Examples (subplots)	24s
	22m 33s

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