Add extra themes #551

Job	Run time
Clippy	2m 12s
Rustfmt	14s
semver	47s
Tests (windows-latest)	1m 56s
Build Wasm Examples (basic)	58s
Tests (ubuntu-latest)	1m 56s
Build Wasm Examples (callback-example)	54s
Tests (macos-latest)	1m 22s
Build Examples (3d_charts)	24s
Build Examples (kaleido)	1m 34s
Build Examples (images)	36s
Build Book	1m 33s
Build Examples (scientific_charts)	28s
Build Examples (subplots)	24s
Build Examples (ndarray)	26s
Build Examples (basic_charts)	28s
Build Examples (shapes)	31s
Build Examples (financial_charts)	26s
Build Examples (maps)	40s
Code Coverage	12s
Build Examples (custom_controls)	23s
	18m 24s

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