fix issue #2628 deprecated link in "Contributing" tab in repo home page

[SubhamJM]

• [x ] Closes deprecated link in "Contributing" tab in repo home page #2628
• [ x] I am familiar with the contributing guidelines
• [ x] Tests added
• [x ] Updates entries in .github/CONTRIBUTIONS.md for API changes.
• [ x] Adds description and name entries in the appropriate "what's new" file in docs/sphinx/source/whatsnew for all changes. Includes link to the GitHub Issue with :issue:`num` or this Pull Request with :pull:`num`. Includes contributor name and/or GitHub username (link with :ghuser:`user`).
• [ x] New code is fully documented. Includes numpydoc compliant docstrings, examples, and comments where necessary.
• [ x] Pull request is nearly complete and ready for detailed review.
• [ x] Maintainer: Appropriate GitHub Labels (including remote-data) and Milestone are assigned to the Pull Request and linked Issue.