cleanup readme #25

Job	Run time
Build Book	3m 29s
Build Wasm Examples (basic)	56s
Build Wasm Examples (callback-example)	56s
Clippy	4m 4s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	5m 54s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	2m 54s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 18s
Code Coverage	9s
Rustfmt	16s
semver	47s
Build Examples (3d_charts)	34s
Build Examples (customization/density_mapbox_example)	34s
Build Examples (custom_controls)	36s
Build Examples (shapes)	35s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 24s
Build Examples (customization/multiple_plots_example)	35s
Build Examples (ndarray)	34s
Build Examples (scientific_charts)	36s
Build Examples (financial_charts)	37s
Build Examples (customization/consistent_static_format_export)	1m 32s
Build Examples (statistical_charts)	26s
Build Examples (basic_charts)	34s
Build Examples (kaleido)	1m 16s
Build Examples (images)	52s
Build Examples (maps)	47s
Build Examples (subplots)	32s
Build Examples (themes)	32s
	36m 19s

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