doc: use npm-published version of doc-kit #4398

Job	Run time
Build slim tarball	2m 8s
x86_64-darwin: with shared libraries	32m 24s
aarch64-linux: with shared libraries	18m 24s
aarch64-darwin: with shared libraries	22m 34s
x86_64-linux: with shared libraries	23m 12s
	1h 38m 42s

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