feat: embed docs for flags/arguments for `-h`/`--help` #1203

Job	Run time
audit	2m 37s
msrv-check (ubuntu-latest)	7m 11s
cargo-doc	14m 52s
lint	6m 39s
msrv-check (macos-latest)	5m 25s
tests (ubuntu-latest)	28m 5s
Spell Check with typos-cli (rs crate)	7s
tests (macos-latest)	24m 7s
	1h 29m 3s

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