docs: modernize the site theme #3343

Job	Run time
checks / docs	37s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.11, lowest-direct, windows-latest)	1m 44s
checks / test (3.13, locked, windows-latest)	1m 44s
checks / test (3.10, locked, windows-latest)	2m 3s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 31s
checks / test (3.12, lowest-direct, windows-latest)	2m 16s
checks / test (3.10, locked, ubuntu-latest)	1m 23s
checks / readme-snippets	16s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.12, locked, windows-latest)	1m 44s
checks / test (3.13, lowest-direct, windows-latest)	1m 51s
checks / test (3.14, lowest-direct, windows-latest)	2m 23s
checks / test (3.10, lowest-direct, windows-latest)	2m 0s
checks / test (3.13, locked, ubuntu-latest)	1m 16s
checks / test (3.14, locked, ubuntu-latest)	1m 58s
checks / test (3.12, locked, ubuntu-latest)	1m 41s
checks / test (3.11, locked, ubuntu-latest)	1m 22s
checks / test (3.11, locked, windows-latest)	2m 5s
checks / test (3.14, locked, windows-latest)	2m 53s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / pre-commit	55s
all-green	2s
	37m 8s

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