Refactor bookmark manager

[quambene]

• Select sources for bogrep configure if no sources are configured
• Fix removing ignored urls

[codecov]

Codecov Report

Attention: Patch coverage is 90.22416% with 157 lines in your changes are missing coverage. Please review.

Project coverage is 90.33%. Comparing base (ddc1e00) to head (a5dc2c7).

Files	Patch %	Lines
src/bookmarks/bookmark_service.rs	87.40%	65 Missing ⚠️
src/bookmarks/bookmark_manager.rs	95.78%	21 Missing ⚠️
src/cmd/configure.rs	86.36%	18 Missing ⚠️
src/bookmarks/target_bookmarks.rs	91.82%	13 Missing ⚠️
src/bookmark_reader/source_reader.rs	0.00%	6 Missing ⚠️
src/bookmarks/mod.rs	64.70%	6 Missing ⚠️
src/client.rs	80.00%	6 Missing ⚠️
src/cmd/fetch.rs	85.71%	4 Missing ⚠️
src/bookmarks/source_bookmarks.rs	66.66%	3 Missing ⚠️
src/cmd/import.rs	90.00%	3 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   91.27%   90.33%   -0.94%     
==========================================
  Files          36       36              
  Lines        6327     5641     -686     
==========================================
- Hits         5775     5096     -679     
+ Misses        552      545       -7     

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