Switch from askama to rinja (#227) #284

Job	Run time
Clippy	2m 55s
Code Coverage	1m 48s
Build Wasm Examples (wasm-yew-minimal)	1m 7s
Build Examples (3d_charts)	35s
Build Examples (basic_charts)	36s
Rustfmt	12s
semver	3m 39s
Build Examples (custom_controls)	25s
Tests (ubuntu-latest)	2m 17s
Build Examples (financial_charts)	34s
Tests (windows-latest)	4m 25s
Build Examples (images)	42s
Tests (macos-latest)	1m 55s
Build Examples (kaleido)	1m 19s
Build Examples (maps)	31s
Build Examples (ndarray)	27s
Build Examples (scientific_charts)	33s
Build Examples (shapes)	26s
Build Examples (subplots)	23s
	24m 49s

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