Fixes #86: GitHub icon navigation in Navbar

[Ni1esh-Yadav]

Summary

This PR fixes the issue where clicking the GitHub button in the profile dropdown did not trigger any action. Now, clicking the button correctly navigates to the CCSync GitHub repository

Changes Made

• Fixed the onClick handler for the GitHub dropdown menu item.
• Implemented window.open(url, "_blank") to redirect users to the GitHub repo.
• Ensured smooth navigation without breaking other dropdown functionalities.

✅ Fixes

Closes #86

Steps to Test

1. Log in using Google credentials.
2. Click on the profile avatar in the top-right corner.
3. Click on the GitHub button in the dropdown.
4. It should open the GitHub repository in a new tab.

Expected Behavior

• Clicking the GitHub icon now correctly redirects to the repository.
• Works seamlessly with no UI or functionality breakage.