docs: Improve usage documentation

[janw]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.91%. Comparing base (a120190) to head (d026b54).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   91.93%   91.91%   -0.02%     
==========================================
  Files          22       22              
  Lines        1103     1101       -2     
  Branches       98       98              
==========================================
- Hits         1014     1012       -2     
  Misses         65       65              
  Partials       24       24              

Files with missing lines	Coverage Δ
podcast_archiver/config.py	92.22% <ø> (-0.17%)	⬇️

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