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feat(search): add Hex project search and notebook reads #1256

Job	Run time
docs changes	27s
docs benchmark (${{ matrix.target }})	-1s
docs source	1m 50s
docs build	1m 59s
docs acceptance (chromium)	2m 23s
docs acceptance (corpus)	3m 2s
docs acceptance (http)	2m 42s
docs acceptance (webkit)	3m 25s
docs HTTP	2s
	15m 49s