Remove references to old feedback form

[lpsinger]

Fixes #2205.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.23%. Comparing base (71eca36) to head (9f2217f).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #2733      +/-   ##
========================================
- Coverage   6.24%   6.23%   -0.01%     
========================================
  Files        167     167              
  Lines       4246    4248       +2     
  Branches     471     472       +1     
========================================
  Hits         265     265              
- Misses      3979    3981       +2     
  Partials       2       2              

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