Comprehensive docs update

[liquidsec]

Summary

• Consolidate targets/seeds/blacklists into one section, add missing input types (ASN, USERNAME)
• Fix preset docs: add validation section, full YAML key reference table
• Update event docs: add host_metadata, fix JSON example, add VIRTUAL_HOST type
• Add undocumented output modules (emails, web_report, nmap_xml, message queues, MongoDB)
• Rewrite contribution guide with AI policy, dev branch guidance, CLA link
• Add CONTRIBUTIONS.md repo root pointer
• Fix troubleshooting: Python 3.10+ requirement, uv install, add cache clearing section
• Fix dev reference: broken links, invalid Scanner kwargs in code examples
• Fix dev environment: git clone URL syntax, add dev branch checkout step, add ruff check
• Add 2.8.1-2.8.6 to release history
• Add navigation links between scanning pages
• Fix config path references, typos, stale CLI flags

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90%. Comparing base (ef65b09) to head (df81eb3).

Additional details and impacted files

@@          Coverage Diff           @@
##             dev   #3208    +/-   ##
======================================
+ Coverage     90%     90%    +1%     
======================================
  Files        453     451     -2     
  Lines      46101   45486   -615     
======================================
- Hits       41211   40747   -464     
+ Misses      4890    4739   -151     

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