Improve documentation site layout #517

Job	Run time
build / lint-rust	23s
build / lint-toml	8s
build / generate-license	2m 20s
build / lint-python	10s
build / check-crates-patch	-1s
build / Linux arm64 (3.13t)	11m 1s
build / Linux arm64 (abi3)	11m 1s
build / Linux x86_64 (abi3)	11m 5s
build / Linux x86_64 (3.13t)	11m 4s
build / Windows x86_64 (3.13t)	11m 17s
build / Linux arm64 (3.14t)	11m 1s
build / Linux x86_64 (3.14t)	11m 4s
build / macOS arm64 (3.14t)	9m 29s
build / macOS arm64 (abi3)	9m 29s
build / Windows x86_64 (abi3)	11m 17s
build / macOS arm64 (3.13t)	7m 14s
build / Windows x86_64 (3.14t)	11m 23s
build / Source distribution	0s
build / macOS x86_64 (${{ matrix.python-tag }})	0s
build / Build docs	1s
build / Merge build artifacts	1s
test	-1s
	2h 9m 26s

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