Route attributes register example

[rustamwin]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

[what-the-diff]

PR Summary

• New route added in bootstrap.php
  The bootstrap.php file has been updated to include a new route for better navigation within the application.
• Router configuration updated
  The router configuration file now has the RouteAttributesRegistrarInterface and associated class for improved route handling.
• Comment block for site/index route
  A comment block has been added in the routes/routes.php file to explain the site/index route functionality.
• Language group and site/index annotations on SiteController
  The SiteController now includes a language group annotation to handle different languages and a Get annotation for the 'site/index' route to enhance the overall user experience.