Implemented Custom 404 Error Page with Themed Design and Home Navigation

[Sravan-kumar04]

📌 Related Issue

Closes #180

✨ What’s New

• Added a custom 404 error page that aligns with the site’s theme and branding.
• Large floating “404” text with subtle glowing animation.
• Friendly error message: “Oops! Page not found”.
• Prominent “Go Home” button styled in site’s accent colors (green/yellow).
• Responsive design that looks great on both desktop and mobile.
• Adjusted layout to work with fixed navbar (content pushed down).
• Added background glow effects for a modern aesthetic.

🎯 Why This Change

• Replaces the default browser/server 404 page which was inconsistent with the design.
• Provides a user-friendly fallback with clear navigation options.
• Enhances overall UX and maintains brand consistency.

🖼️ Preview

✅ Checklist

• Matches application theme (dark background + yellow/green accents)
• Responsive on all screen sizes
• Works with React Router navigation
• Tested navigation back to home

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[Sravan-kumar04]

@agamjotsingh18 please review this #180 and update me