📦 1.1: Templates, exception, and error pages

Avacha comes with a huge update 1.1 🐻

Now Avacha is charged with:

• Templates powered by Latte
• Response helpers: respond_with_status, respond_with_template
• Static assets
• .env configuration
• Simplified namespaces: Avacha\Framework\ to Avacha\, App\Http\Controllers to App\Controllers
• HTTP error page
• PHP exceptions are now displayed on page on debug mode enabled
• Kernel is now accessible everywhere by using KERNEL constant