Add extra themes #555

Job	Run time
semver	59s
Clippy	3m 31s
Code Coverage	11s
Rustfmt	15s
Build Wasm Examples (callback-example)	52s
Tests (macos-latest)	2m 18s
Tests (ubuntu-latest)	1m 57s
Tests (windows-latest)	3m 40s
Build Examples (images)	44s
Build Book	1m 40s
Build Wasm Examples (basic)	53s
Build Examples (customization)	25s
Build Examples (ndarray)	23s
Build Examples (custom_controls)	50s
Build Examples (3d_charts)	28s
Build Examples (basic_charts)	24s
Build Examples (maps)	37s
Build Examples (financial_charts)	23s
Build Examples (themes)	30s
Build Examples (shapes)	26s
Build Examples (kaleido)	1m 10s
Build Examples (subplots)	22s
Build Examples (scientific_charts)	29s
	23m 27s

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