feat: embed docs for flags/arguments for `-h`/`--help` #838

Job	Run time
plan	18s
build-local-artifacts (aarch64-apple-darwin)	3m 29s
build-local-artifacts (aarch64-unknown-linux-gnu)	3m 17s
build-local-artifacts (x86_64-apple-darwin)	2m 34s
build-local-artifacts (x86_64-pc-windows-msvc)	5m 13s
build-local-artifacts (x86_64-unknown-linux-gnu)	1m 43s
build-global-artifacts	15s
host	0s
publish-npm	0s
announce	0s
	16m 49s

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