Cleaning references to no longer existing CSS classes

[pdelboca]

All of this sect-* classes are references to our all CSS structure (before Tailwind).

Currently, we only have sect and sect-highlights and sect-spotlight. All other no longer exist.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3b028d2) 88.61% compared to head (0aeff94) 88.61%.
Report is 11 commits behind head on develop.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1052   +/-   ##
========================================
  Coverage    88.61%   88.61%           
========================================
  Files           97       97           
  Lines         1203     1203           
  Branches        49       49           
========================================
  Hits          1066     1066           
  Misses         135      135           
  Partials         2        2           

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