Feat: Adding custom 404 not found page for the website

[RamakrushnaBiswal]

Describe the feature

Adding custom 404 not found page for the website

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• I agree to follow this project's Code of Conduct
• I'm a GSSoC'24 contributor
• I want to work on this issue

[github-actions]

Congratulations, @RamakrushnaBiswal! 🎉 Thank you for creating your issue. Your contribution is greatly appreciated and we look forward to working with you to resolve the issue. Keep up the great work!

We will promptly review your changes and offer feedback. Keep up the excellent work! Kindly remember to check our contributing guidelines

[NilanchalaPanda]

Hello @hereisSwapnil, I can work on this issue. Can you please assign it.