Allow to customize Headline Sizes

[tvdeyen]

What is this pull request for?

Pass a multi dimensional array instead of numbers and Alchemy will use this for the select tag

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have added tests to cover this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.86%. Comparing base (5f1790c) to head (c03285b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2843   +/-   ##
=======================================
  Coverage   95.86%   95.86%           
=======================================
  Files         229      229           
  Lines        6208     6211    +3     
=======================================
+ Hits         5951     5954    +3     
  Misses        257      257           

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