ruff + fix FAQ + remove announcement

[raphaelvallat]

Apply latest version of ruff (0.9.2) + fix divider in FAQ

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 29.26829% with 29 lines in your changes missing coverage. Please review.

Project coverage is 77.24%. Comparing base (83cb56c) to head (aa8b1d4).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/yasa/evaluation.py	0.00%	29 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #199   +/-   ##
=======================================
  Coverage   77.24%   77.24%           
=======================================
  Files          13       13           
  Lines        2659     2659           
  Branches      324      324           
=======================================
  Hits         2054     2054           
  Misses        568      568           
  Partials       37       37           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.