refactor examples to generate standalone html #519

Job	Run time
Clippy	2m 56s
Rustfmt	14s
semver	44s
Tests (windows-latest)	3m 42s
Build Wasm Examples (basic)	53s
Code Coverage	9s
Build Examples (maps)	22s
Build Examples (3d_charts)	23s
Build Examples (basic_charts)	24s
Build Examples (ndarray)	23s
Build Examples (custom_controls)	25s
Build Examples (kaleido)	1m 9s
Build Examples (subplots)	30s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	34s
Build Wasm Examples (callback-example)	52s
Tests (macos-latest)	2m 49s
Build Examples (financial_charts)	22s
Tests (ubuntu-latest)	1m 55s
Build Examples (images)	53s
	20m 2s

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