Remove Alien::raylib from bindings list

* `Alien::raylib` downloads raylib, builds it and installs it in the Perl module path (Basically abusing CPAN as package manager)
* `Graphics::Raylib::XS` depends on `Alien::raylib` and reexports all C symbols as XS symbols usable in Perl
* `Graphics::Raylib` depends on `Graphics::Raylib::XS` and is the actual Perl wrapper with a Perlish API, which users should be using

CONTRIBUTING.md

@@ -79,7 +79,6 @@ Some people ported raylib to other languages in form of bindings or wrappers to
  - [raylib Nim binding](https://gitlab.com/define-private-public/raylib-Nim)
  - [raylib Crystal binding](https://gitlab.com/Zatherz/cray) 
  - [raylib Perl wrapper](https://metacpan.org/pod/Graphics::Raylib) 
- - [raylib Perl frontend](https://github.com/athreef/Alien-raylib)
  - raylib Pascal binding with custom IDE (closed-source)
  
 Usually, raylib bindings follow the convention: `raylib-{language}`