feat: remove chapter and topic feature

[gary02]

re https://github.com/thematters/matters-server/issues/3804

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 58.52%. Comparing base (2f19f46) to head (6d3edfe). Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3846      +/-   ##
===========================================
- Coverage    58.85%   58.52%   -0.34%     
===========================================
  Files          897      882      -15     
  Lines        17520    17242     -278     
  Branches      3136     3088      -48     
===========================================
- Hits         10312    10091     -221     
+ Misses        7157     7100      -57     
  Partials        51       51              

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