fixed smooth scrolling in about section

[Nilam-Kumari-Mahato]

Contributor Info

Your Name:
Nilam Kumari Mahato

---

Related Issue

Fixes: #633

---

Description

This PR fixes the issue where the Back to Top button directly jumped to the top of the page instead of smoothly scrolling.

---

Screenshots / Video (Before & After)

Before:

Screen.Recording.2025-08-24.155758.mp4

After:

Screen.Recording.2025-08-25.223716.mp4

---

Checklist

• Mentioned the issue number in this PR.
• Created a separate branch (not main) before committing.
• Changes tested and verified.
• Attached necessary screenshots/videos for clarity.
• Code is clean, readable, and commented where necessary.
• No merge conflicts.
• Follows the design/style guide of the project.
• Added contributor name above.
• Confirmed that the feature fits well with the latest updated version of the website.
• Ensured images and layout are responsive (look good on both desktop and small screens like phones).

---

Extra Notes (Optional)

Checkout the screen recording that has been added.

---

[github-actions]

Thanks for creating a PR for your Issue! ☺️

We'll review it as soon as possible.
In the meantime, please double-check the file changes and ensure that all commits are accurate.

If there are any unresolved review comments, feel free to resolve them. 🙌🏼