`clap` completions and manpages

[codecov[bot]]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (a1173d4) 41.06% compared to head (91a5818) 40.96%.

Files	Patch %	Lines
rage/build.rs	0.00%	18 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #444 +/- ## ========================================== - Coverage 41.06% 40.96% -0.11% ========================================== Files 35 35 Lines 3163 3181 +18 ========================================== + Hits 1299 1303 +4 - Misses 1864 1878 +14 ```

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