Improve documentation site layout #512

Job	Run time
build / lint-rust	2m 5s
build / lint-toml	6s
build / generate-license	2m 27s
build / lint-python	10s
build / check-crates-patch	0s
build / Linux x86_64 (3.14t)	3m 35s
build / Linux x86_64 (abi3)	3m 36s
build / macOS arm64 (3.13t)	3m 51s
build / Linux arm64 (3.14t)	3m 32s
build / Linux arm64 (3.13t)	3m 32s
build / macOS arm64 (abi3)	3m 53s
build / Windows x86_64 (abi3)	3m 46s
build / Windows x86_64 (3.13t)	3m 47s
build / Linux x86_64 (3.13t)	3m 34s
build / Linux arm64 (abi3)	3m 33s
build / macOS arm64 (3.14t)	3m 53s
build / Windows x86_64 (3.14t)	3m 49s
build / macOS x86_64 (${{ matrix.python-tag }})	-1s
build / Source distribution	-1s
build / Build docs	1s
build / Merge build artifacts	1s
test	0s
	49m 9s

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