Added Smooth Scrolling in B2T | Issue #829

[Shariq2003]

Closes: #829

• Title: Added Smooth Scrolling in B2T
• Name: Shariq
• Idenitfy yourself:
  GSSOC Ext

Describe the add-ons or changes you've made 📃

I have added smooth scrolling in back to top button.

Screenshots 📷

bandicam.2024-10-18.01-57-56-342.mp4

Type of change ☑️

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Note to reviewers 📄

[vercel]

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A member of the Team first needs to authorize it.

[github-actions]

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
web-master-log	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 18, 2024 10:04am

[Avdhesh-Varshney]

Issue to be assigned before raising the pr