[lucianoratamero]

One-line summary

Make the advertising section header's subheading a rich text field, and allow sections to have no content blocks.

Significant changes and points to review

Issue / Bugzilla link

WT-1889

Testing

Verify in the CMS admin: a subheading with formatting renders correctly on the page, and a section with no content blocks saves and renders.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.73%. Comparing base (9585bea) to head (29422e0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17473      +/-   ##
==========================================
+ Coverage   84.62%   84.73%   +0.10%     
==========================================
  Files         172      172              
  Lines        8710     8710              
==========================================
+ Hits         7371     7380       +9     
+ Misses       1339     1330       -9     

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