Update pretty relative index links to rewrite to ./ instead of /

[caendesilva]

This fixes an edge case bug when using pretty URLs in a subdirectory where the index page was not properly resolved relatively.

So a link to 'index.html' when using pretty URLs is now actually relative, instead of linking to the webroot which breaks subdirectories and local browsing. Both . and ./ work, so I choose the latter as I think it looks better.

[codecov]

Codecov Report

Merging #1238 (d5f89a2) into master (03d3235) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##              master     #1238     +/-   ##
=============================================
  Coverage     100.00%   100.00%             
- Complexity      1315      2634   +1319     
=============================================
  Files            152       304    +152     
  Lines           3457      6918   +3461     
=============================================
+ Hits            3457      6918   +3461     

Impacted Files	Coverage Δ
...ges/framework/src/Foundation/Kernel/Hyperlinks.php	100.00% <100.00%> (ø)
...amework/Actions/PostBuildTasks/GenerateRssFeed.php	100.00% <0.00%> (ø)
...framework/src/Console/Commands/MakePostCommand.php	100.00% <0.00%> (ø)
...ackages/framework/src/Foundation/Facades/Pages.php	100.00% <0.00%> (ø)
.../packages/framework/src/Foundation/PharSupport.php	100.00% <0.00%> (ø)
...rk/src/Framework/Factories/Concerns/HasFactory.php	100.00% <0.00%> (ø)
...src/Framework/Exceptions/FileNotFoundException.php	100.00% <0.00%> (ø)
...c/Framework/Actions/CreatesNewMarkdownPostFile.php	100.00% <0.00%> (ø)
...work/src/Console/Commands/VendorPublishCommand.php	100.00% <0.00%> (ø)
...ework/src/Console/Commands/BuildSitemapCommand.php	100.00% <0.00%> (ø)
... and 143 more

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