boulder: Add support for compressman option

[joebonrichie]

Compresses any man/info pages with zstd. A tradeoff between slightly bigger .stone files vs smaller installed size.

Tested

• nano (contains man and info files)
• xz (contains lots of man symlinks)

[livingsilver94]

Although I'm not a Rust expert, let's try to make this code more idiomatic by using the Path/PathBuf structs.

[joebonrichie]

Should be good now

[joebonrichie]

🏓

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