Expand documentation for ASS subtitles style filtering

[GitBib]

Summary

This pull request expands the documentation related to style filtering in ASS subtitles.

Changes

• Added detailed explanations for:
  • only_default_style
  • include_styles
  • exclude_styles
• Included examples for style filtering options in both CLI and Python contexts.
• Clarified mutual exclusivity of specific style filtering options.
• Documented the newly introduced get_styles method and the corresponding CLI styles command.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.60%. Comparing base (61362e9) to head (3391016).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #36   +/-   ##
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  Coverage   99.60%   99.60%           
=======================================
  Files           5        5           
  Lines         254      254           
=======================================
  Hits          253      253           
  Misses          1        1           

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