Description

When users navigate to a non-existent route (e.g., https://as-help.vercel.app/random), the site currently shows a generic 404 error or blank page.
To improve user experience, a custom 404 page should be implemented that clearly communicates the error and allows users to easily return.

Expected Behaviour

A dedicated custom 404 page should appear when users access a non-existent route.

The page should:

• Display a friendly message (e.g., “Oops! Page not found 😅”)

• Match the site’s current theme and branding

• Include a “Go Back” .

• Include a small illustration or icon for visual feedback

Kindly assign me this issue under Hacktoberfest 25