Add extra themes #550

Job	Run time
Rustfmt	14s
semver	48s
Code Coverage	9s
Clippy	2m 35s
Tests (ubuntu-latest)	2m 7s
Tests (windows-latest)	3m 17s
Tests (macos-latest)	2m 42s
Build Wasm Examples (callback-example)	1m 1s
Build Examples (3d_charts)	24s
Build Wasm Examples (basic)	1m 0s
Build Examples (basic_charts)	34s
Build Examples (kaleido)	1m 27s
Build Examples (images)	56s
Build Examples (financial_charts)	27s
Build Examples (custom_controls)	29s
Build Examples (scientific_charts)	25s
Build Examples (maps)	42s
Build Book	1m 26s
Build Examples (ndarray)	24s
Build Examples (subplots)	23s
Build Examples (shapes)	24s
	21m 54s

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