doc: use npm-published version of doc-kit #4399

Job	Run time
Build slim tarball	2m 1s
aarch64-darwin: with shared libraries	19m 48s
aarch64-linux: with shared libraries	19m 14s
x86_64-darwin: with shared libraries	32m 58s
x86_64-linux: with shared libraries	21m 41s
	1h 35m 42s

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