docs: use clap_mangen and roff to generate manpage #231
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Fixes #226.
cargo xtask gen && man gen/sd.1
to try it out.I think this also fixes (?) #134, including list of flags and its formatting, and return codes. Unfornutaly clap_mangen has no custom section support (yet), so I've learned from clap-rs/clap#3579 and used roff to make the EXIT STATUSES and EXAMPLES sections.
Note that the list of flags formatting is "fixed" with separating each flag into its own paragraph, but that should be tolerable I guess.