fix embed code for wordpress's strict HTML

[artoonie]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.77%. Comparing base (c187689) to head (d678d81).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #506      +/-   ##
==========================================
- Coverage   96.79%   96.77%   -0.02%     
==========================================
  Files         121      121              
  Lines        5799     5799              
==========================================
- Hits         5613     5612       -1     
- Misses        186      187       +1     

see 1 file with indirect coverage changes

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