Full-stack Interactive Comments Section

I pushed myself to create a complete full-stack version of this project with additional features.

During the integration of upvote and downvote features with MongoDB, and updating the user interface when comments or replies are deleted, edited, or posted, I encountered some challenges. Nevertheless, I managed to successfully implement these features.

However, I think my code requires restructuring to improve its performance and make it more user-friendly for developers. I would be grateful if you could review the project and give me your valuable feedback. Thank you.