feat: Add checkbox to filter new challenges

[sadakchap]

Title and Issue number

Title : [Challenges] Add checkbox to filter new challenges

Issue No. : https://github.com/sadanandpai/frontend-mini-challenges/issues/400

Close #

Checklist:

• [x] I have mentioned the issue number in my Pull Request.
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have created a helpful and easy to understand README.md
• [ ] I have updated the Index.html file for my contribution

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[sadakchap]

Something like this? @sadanandpai

https://github.com/sadanandpai/frontend-mini-challenges/assets/44117648/acbf86d3-32a8-4a34-8f7a-8a83129627eb

[sadanandpai]

@sadakchap conflicts

[sadanandpai]

@sadakchap let me know if you help here to get unblocked