refactor examples to generate standalone html #516

Job	Run time
semver	46s
Code Coverage	9s
Build Wasm Examples (wasm-yew-minimal)	9s
Build Wasm Examples (wasm-yew-callback-minimal)	9s
Clippy	1m 56s
Rustfmt	16s
Tests (windows-latest)	5m 11s
Tests (macos-latest)	2m 36s
Build Examples (financial_charts)	24s
Build Examples (basic_charts)	27s
Tests (ubuntu-latest)	2m 21s
Build Examples (custom_controls)	25s
Build Examples (3d_charts)	25s
Build Examples (kaleido)	1m 30s
Build Examples (ndarray)	32s
Build Examples (maps)	24s
Build Examples (images)	38s
Build Examples (shapes)	27s
Build Examples (scientific_charts)	22s
Build Examples (subplots)	23s
	19m 30s

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