docs: Remove moved sections

[ashtum]

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[cppalliance-bot]

An automated preview of the documentation is available at https://3009.beast.prtest.cppalliance.org/libs/beast/doc/html/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.11%. Comparing base (19c38c3) to head (57f91df).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3009      +/-   ##
===========================================
- Coverage    93.12%   93.11%   -0.01%     
===========================================
  Files          176      176              
  Lines        13643    13643              
===========================================
- Hits         12705    12704       -1     
- Misses         938      939       +1     

see 1 file with indirect coverage changes

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[cppalliance-bot]

An automated preview of the documentation is available at https://3009.beast.prtest.cppalliance.org/libs/beast/doc/html/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://3009.beast.prtest.cppalliance.org/libs/beast/doc/html/index.html