Added scroll to top button

[SurajPrakash24]

Related Issue

Fixes #211

Description of Changes

I have added a scroll to top button in the application.

-the button appears when the user scrolls down more than 200 pixels.
-Button smoothly scrolls the page back to the top when clicked.
-Used window.scrollY for detecting scroll position and added responsive styling for better user experience

@dhairyagothi Plz review and accept the PR under gssoc-ext level 2 and hacktoberfest-accepted.

Type of Pull Request

• Bug Fix
• New Feature
• Performance Improvement
• Documentation Update
• Code Refactoring
• Security Enhancement
• Other (Specify): _______________

Screenshots / Demo

Checklist for Contributor

• I have reviewed my code before submission.
• I have read and followed the project's Contribution Guidelines.
• I have tested the code thoroughly.
• I have attached related issue numbers, screenshots, or videos (if applicable).
• I have added comments to my code where necessary for clarity.
• I have checked the existing code base and my changes do not introduce any breaking changes.
• My PR addresses only one issue; I have created separate PRs for other issues.
• I have ensured that the PR does not include unrelated files.
• I am mindful of the project's coding standards and best practices.

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[github-actions]

🎉 Your pull request has been successfully merged! 🎉 Thank you for your valuable contribution to Station Guide. Your efforts are greatly appreciated. Feel free to reach out if you have any more contributions or if there's anything else we can assist you with. Keep up the fantastic work! 🚀