fix book example generation and inclusion #540

Job	Run time
Rustfmt	13s
semver	57s
Clippy	2m 37s
Tests (ubuntu-latest)	2m 7s
Code Coverage	14s
Tests (windows-latest)	4m 14s
Tests (macos-latest)	2m 22s
Build Book	1m 46s
Build Wasm Examples (basic)	1m 16s
Build Examples (scientific_charts)	32s
Build Examples (maps)	43s
Build Examples (basic_charts)	34s
Build Wasm Examples (callback-example)	1m 6s
Build Examples (3d_charts)	26s
Build Examples (custom_controls)	32s
Build Examples (ndarray)	33s
Build Examples (shapes)	29s
Build Examples (subplots)	44s
Build Examples (images)	38s
Build Examples (kaleido)	1m 19s
Build Examples (financial_charts)	23s
	23m 45s

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