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fix(docs): polish code rendering and keyboard navigation #1586

Job	Run time
docs changes	29s
docs benchmark (${{ matrix.target }})	-1s
docs build	1m 24s
docs source	1m 58s
docs acceptance (corpus)	2m 23s
docs acceptance (chromium)	2m 47s
docs acceptance (http)	1m 49s
docs acceptance (webkit)	2m 5s
docs HTTP	3s
	12m 57s