Improve docs formatting, support dark mode #19

Job	Run time
build-and-test (20, ubuntu-latest)	32s
build-and-test (24, windows-latest)	1m 5s
build-and-test (20, windows-latest)	1m 12s
build-and-test (24, ubuntu-latest)	29s
build-and-test (22, ubuntu-latest)	34s
build-and-test (22, windows-latest)	1m 39s
	5m 31s

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