Add Boost Guidelines

[pushpak1300]

Related to laravel/boost#349

Description

This merge request adds the Filament guidelines that were previously part of the Laravel Boost package. Managing these guidelines within Boost had become increasingly difficult. Previously, Filament was included directly in the Boost package because there was no way to add external guideline sources. With the new third-party guidelines
feature, these guidelines can now live within the Filament package itself, avoiding ongoing maintenance in Boost.

Under this change, Filament users can opt in by manually selecting the Filament guidelines when running the Boost install command instead of having them added automatically to the global guidelines. This creates a more modular and consistent behaviour across all third-party packages. The Filament guidelines will continue to work seamlessly with the Boost Search Docs tool, and Filament documentation will still be indexed without any issues.

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.