feat: set the front matter on a source

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
feat: set the front matter on a source

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (52a65e8) to head (f097072).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #235   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          485       490    +5     
  Branches       111       112    +1     
=========================================
+ Hits           485       490    +5     

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