Convert navigation menu generation to service

[caendesilva]

Will resolve the following

• Fix Feature request: Add front matter option to Markdown pages to hide them from the navbar #77
• Fix Convert navigation menu generation to service #179
• Fix Add a navigation menu item model #193
• Fix Dropping support for automatic linking to readmes in documentation pages #197

[codecov]

Codecov Report

Merging #187 (a856389) into master (21dc056) will decrease coverage by 0.56%.
The diff coverage is 85.18%.

@@              Coverage Diff              @@
##              master     #187      +/-   ##
=============================================
- Coverage     100.00%   99.43%   -0.57%     
- Complexity       789      821      +32     
=============================================
  Files            101      103       +2     
  Lines           2034     2108      +74     
=============================================
+ Hits            2034     2096      +62     
- Misses             0       12      +12     

Impacted Files	Coverage Δ
.../framework/src/Actions/GeneratesNavigationMenu.php	100.00% <ø> (ø)
packages/framework/src/Contracts/AbstractPage.php	82.60% <68.42%> (-17.40%)	⬇️
packages/framework/src/Facades/Route.php	100.00% <100.00%> (ø)
packages/framework/src/Models/NavItem.php	100.00% <100.00%> (ø)
...ramework/src/Models/Parsers/MarkdownPageParser.php	100.00% <100.00%> (ø)
...ramework/src/Modules/Navigation/NavigationMenu.php	100.00% <100.00%> (ø)
packages/framework/src/Modules/Routing/Route.php	100.00% <100.00%> (ø)

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[caendesilva]

Dropping support for automatic linking to readmes in documentation pages. It adds a lot of complexity, and if your docs site doesn't have an index.html page that's gonna cause larger issues with the site.