docs: modernize the site theme (#3057) #3345

Job	Run time
checks / pre-commit	55s
checks / readme-snippets	14s
checks / docs	48s
checks / test (3.11, lowest-direct, windows-latest)	1m 58s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.12, locked, windows-latest)	2m 8s
checks / test (3.11, locked, windows-latest)	1m 57s
checks / test (3.10, lowest-direct, windows-latest)	2m 21s
checks / test (3.13, locked, ubuntu-latest)	1m 4s
checks / test (3.10, locked, ubuntu-latest)	1m 25s
checks / test (3.14, locked, windows-latest)	3m 4s
checks / test (3.14, lowest-direct, windows-latest)	1m 51s
checks / test (3.11, locked, ubuntu-latest)	1m 23s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.13, locked, windows-latest)	1m 45s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.10, locked, windows-latest)	2m 4s
checks / test (3.12, lowest-direct, windows-latest)	2m 8s
checks / test (3.14, locked, ubuntu-latest)	2m 3s
checks / test (3.12, locked, ubuntu-latest)	1m 36s
checks / test (3.13, lowest-direct, windows-latest)	2m 4s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
all-green	3s
	37m 53s

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