Add Error404 Module and Modify App.jsx

[Swapnadip2005]

Description

This pull request adds a new Error404 module and modifies the App.jsx and index.html files.

• The Error404 module includes its JSX file, CSS module, and assets to improve error handling and user experience.
• Updates to App.jsx ensure integration of the Error404 module.
• Modifications to index.html enhance the application's structure and meta content.

Motivation:
These changes aim to improve the application's error handling by providing a dedicated Error404 page, ensuring users are guided effectively when encountering broken links or missing pages.

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Type of Change

• 🆕 New Feature
• 🐛 Bug Fix
• 🖼 Wallpaper Added
• 🎨 UI/Design Update
• 🔄 Refactor/Code Improvement
• 📂 Other (Specify here):

Issue Linked: Fixes #20

Video

404Error.mp4

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Checklist

• 📖 I have read and followed the Contributing Guidelines.
• ✅ My code adheres to the project's style guidelines.
• 🧪 I have tested my changes locally and ensured no existing functionality is broken.

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Additional Notes

The Error404 module is a new addition and may require future adjustments as the application evolves.

[Parnab03]

You’ve done a great job! We will wait for the other contributor to submit their PR for this issue within a day. If they don’t, we will accept yours. If they do, the best one will be selected.

[Parnab03]

Congratulations!

[Swapnadip2005]

Thanks a lot! Thrilled to see my first PR merged on *WallGodds*. 🚀

…

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