Handle complex parsing logic in new parser action

[caendesilva]

Moves more of the complex parsing logic like dynamic titles and sidebar categories to the new parser action.

[codecov]

Codecov Report

Merging #325 (41ff3ef) into master (6a0eb4d) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #325      +/-   ##
============================================
- Coverage     99.85%   99.85%   -0.01%     
+ Complexity      831      825       -6     
============================================
  Files            96       94       -2     
  Lines          2049     2039      -10     
============================================
- Hits           2046     2036      -10     
  Misses            3        3              

Impacted Files	Coverage Δ
...s/framework/src/Models/Pages/DocumentationPage.php	100.00% <ø> (ø)
.../Actions/GeneratesDocumentationSearchIndexFile.php	100.00% <100.00%> (ø)
...ackages/framework/src/Actions/SourceFileParser.php	100.00% <100.00%> (ø)
...s/framework/src/Contracts/AbstractMarkdownPage.php	100.00% <100.00%> (ø)
packages/framework/src/Services/RssFeedService.php	100.00% <100.00%> (ø)

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