Tweak release processing

[kingthorin]

• Give the version updates workflow a proper name.
• Adjust release documentation to be up-to-date.
• Update release page generator to trim "What's Changed" heading from release description if present (the template already contains the heading in with the capitalization we want).

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.43%. Comparing base (e0edb64) to head (7593991).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1858      +/-   ##
============================================
+ Coverage     92.36%   92.43%   +0.07%     
- Complexity     3555     3558       +3     
============================================
  Files           345      345              
  Lines          7037     7037              
  Branches        686      686              
============================================
+ Hits           6500     6505       +5     
+ Misses          370      367       -3     
+ Partials        167      165       -2     

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[bodiam]

Approved ;)