Fix: Remove Parsed\FrontMatter and Parsed\Content value objects

[localheinz]

This PR

• removes the Parsed\FrontMatter and Parsed\Content value objects

[codecov]

Codecov Report

Merging #8 (919f30e) into main (4dc5ce0) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main        #8   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
+ Complexity        18        12    -6     
===========================================
  Files              5         3    -2     
  Lines             51        37   -14     
===========================================
- Hits              51        37   -14     

Impacted Files	Coverage Δ	Complexity Δ
src/Parsed.php	100.00% <100.00%> (ø)	4.00 <4.00> (ø)
src/YamlParser.php	100.00% <100.00%> (ø)	6.00 <0.00> (+1.00)

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