Update Leaderboard Logic and remove like-dislike logic

[VaibhavArora314]

leaderboard is using likes logic which has been removed from the web app. Perform the following tasks:

1. Update the backend, and remove the like-dislike properties from the user model and anywhere else used in the application.
   

2. Also, update the leaderboard logic to work on user posts' total reactions count.
   

[github-actions]

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[MeetDOD]

I will do this, i will update the leaderboard with the number of reactions user have , @VaibhavArora314 Assign me this !

[github-actions]

Hello @VaibhavArora314! Your issue #379 has been closed. Thank you for your contribution!