Improve documentation site layout #520

Job	Run time
build / generate-license	2m 24s
build / lint-rust	21s
build / lint-toml	9s
build / lint-python	12s
build / check-crates-patch	0s
build / Linux arm64 (3.14t)	1m 34s
build / Linux x86_64 (3.14t)	1m 37s
build / Linux arm64 (3.13t)	1m 32s
build / Linux x86_64 (3.13t)	1m 37s
build / macOS arm64 (3.13t)	1m 38s
build / Windows x86_64 (3.14t)	1m 40s
build / Linux arm64 (abi3)	1m 35s
build / macOS arm64 (abi3)	1m 51s
build / macOS arm64 (3.14t)	1m 38s
build / Windows x86_64 (3.13t)	1m 49s
build / Windows x86_64 (abi3)	1m 48s
build / Linux x86_64 (abi3)	1m 37s
build / Source distribution	-1s
build / macOS x86_64 (${{ matrix.python-tag }})	-1s
build / Build docs	1s
build / Merge build artifacts	1s
test	0s
	23m 2s

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