feat: improve 404 page

[Yogender-verma]

📄 Description

This PR introduces a custom 404 Not Found page for the Vodka website with improved UX and dynamic route awareness.

✨ Changes made

• Added not-found.tsx page using Next.js App Router
• Displays a clean and minimal 404 UI aligned with Vodka design
• Dynamically shows the requested route using usePathname()
• Added navigation actions:
  • Go Home → redirects to homepage
  • Go Back → uses browser history navigation
• Improved handling of invalid/unknown routes

🎯 Purpose

To provide users with a better experience when they land on non-existent routes, making navigation clearer and more helpful.

🧠 Technical details

• Uses next/navigation → usePathname()
• Implements App Router not-found.tsx convention
• Fully responsive UI with Tailwind CSS

📸 Preview

Closes #164

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