scraper: add trailing slash normalization for duplicate detection

[cornelk]

Closes #17

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.01%. Comparing base (401545e) to head (d377a4d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   51.29%   52.01%   +0.71%     
==========================================
  Files          14       14              
  Lines        1084     1094      +10     
==========================================
+ Hits          556      569      +13     
+ Misses        467      465       -2     
+ Partials       61       60       -1     

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