Bugfix: Do not hide documentation pages in subdirectories

[caendesilva]

Fixes #867

[codecov]

Codecov Report

Merging #868 (c550d22) into master (a4f47c6) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##              master      #868     +/-   ##
=============================================
  Coverage     100.00%   100.00%             
- Complexity      1245      2492   +1247     
=============================================
  Files            146       292    +146     
  Lines           3252      6504   +3252     
=============================================
+ Hits            3252      6504   +3252     

Impacted Files	Coverage Δ
.../src/Framework/Factories/NavigationDataFactory.php	100.00% <100.00%> (ø)
...mework/Exceptions/UnsupportedPageTypeException.php	100.00% <0.00%> (ø)
...ramework/src/Console/Commands/RouteListCommand.php	100.00% <0.00%> (ø)
...ework/src/Console/Commands/BuildRssFeedCommand.php	100.00% <0.00%> (ø)
...rc/Framework/Services/YamlConfigurationService.php	100.00% <0.00%> (ø)
...ork/src/Foundation/Concerns/ForwardsHyperlinks.php	100.00% <0.00%> (ø)
...c/Framework/Actions/CreatesNewMarkdownPostFile.php	100.00% <0.00%> (ø)
...packages/framework/src/Pages/DocumentationPage.php	100.00% <0.00%> (ø)
...elop/packages/framework/src/Pages/MarkdownPost.php	100.00% <0.00%> (ø)
...rc/Framework/Concerns/InteractsWithDirectories.php	100.00% <0.00%> (ø)
... and 137 more

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[what-the-diff]

• The method makeHidden() was changed.
• A new condition has been added to the if statement in line 95: ! $this->isInstanceOf(DocumentationPage::class) &&