feat: embed docs for flags/arguments for `-h`/`--help` #846

Job	Run time
plan	14s
build-local-artifacts (aarch64-apple-darwin)	4m 23s
build-local-artifacts (aarch64-unknown-linux-gnu)	2m 42s
build-local-artifacts (x86_64-apple-darwin)	3m 7s
build-local-artifacts (x86_64-pc-windows-msvc)	9m 50s
build-local-artifacts (x86_64-unknown-linux-gnu)	1m 53s
build-global-artifacts	14s
host	0s
publish-npm	0s
announce	0s
	22m 23s

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