Add deprecation notice for Laravel Mix (#10519)

Author: AhmedAlaa4611

mix.md

@@ -5,6 +5,9 @@
 <a name="introduction"></a>
 ## Introduction
 
+> [!WARNING]
+> Laravel Mix is a legacy package that is no longer actively maintained. [Vite](/docs/{{version}}/vite) may be used as a modern alternative.
+
 [Laravel Mix](https://github.com/laravel-mix/laravel-mix), a package developed by [Laracasts](https://laracasts.com) creator Jeffrey Way, provides a fluent API for defining [webpack](https://webpack.js.org) build steps for your Laravel application using several common CSS and JavaScript pre-processors.
 
 In other words, Mix makes it a cinch to compile and minify your application's CSS and JavaScript files. Through simple method chaining, you can fluently define your asset pipeline. For example: