feat: add a Back to home button on sign in page

[anujsharma8d]

Summary

Added a Back to Home button to the Sign In page, allowing users to easily navigate back to the homepage without relying on browser navigation controls.

Closes #1509

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Type of Change

• New feature

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Changes Made

• Added Back to home button on sign in page
• The button redirects on the home page

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How to Test

Steps for the reviewer to verify this works:

1. Open the website
2. Navigate to sign in page
3. Click on the Back to home button
4. It redirects on the home page

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Screenshots (if UI change)

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Checklist

• Linked issue in summary
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff

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Accessibility Checklist

• Responsive UI verified
• Accessibility labels added where needed

[vercel]

@anujsharma8d is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[anujsharma8d]

Hey @Priyanshu-byte-coder
I have fixed the issue.
Kindly review.

[github-actions]

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