Add extra themes #554

Job	Run time
Clippy	2m 11s
Rustfmt	13s
semver	51s
Tests (macos-latest)	2m 13s
Tests (windows-latest)	3m 42s
Tests (ubuntu-latest)	1m 59s
Build Book	1m 42s
Code Coverage	9s
Build Wasm Examples (basic)	56s
Build Wasm Examples (callback-example)	1m 15s
Build Examples (kaleido)	1m 18s
Build Examples (custom_controls)	23s
Build Examples (basic_charts)	26s
Build Examples (financial_charts)	24s
Build Examples (scientific_charts)	26s
Build Examples (maps)	42s
Build Examples (ndarray)	32s
Build Examples (images)	44s
Build Examples (3d_charts)	30s
Build Examples (shapes)	26s
Build Examples (subplots)	23s
Build Examples (themes)	24s
Build Examples (customization)	31s
	22m 20s

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