Add 404 page for Vercel deployment

[RishiByte]

Create a Branded 404 Page

Goal

Create a branded 404 error page that provides users with a helpful navigation path when they visit a non-existent route.

Acceptance Criteria

• Add a static 404.html page.
• Display a clear "404 – Page Not Found" message.
• Include DemonDie branding (logo, name, or visual identity).
• Provide a prominent link or button that redirects users to the homepage.
• Match the site's existing design system, colors, typography, and overall styling.
• Ensure the page is responsive and works well on both desktop and mobile devices.

Expected Outcome

Users who navigate to an invalid URL should see a professional, branded error page that maintains a consistent experience and helps them return to the main website easily.

Additional Notes

• Keep the implementation lightweight.
• Follow the project's existing code style and structure.
• Test the page locally before submitting a pull request.

Labels

good first issue frontend enhancement