Fixed Likes Logic for Blog and Post

[ParasY1724]

Issue No: #58

Description: Array of Username for likedBy is maintain to keep track of users likes . Logic for handle submit:

const newLikedUsers = liked
      ? likedUsers.filter(user => user !== currentUser)
      : [...likedUsers, currentUser];

 const newLikeCount = newLikedUsers.length;

NOTE : This will work only for post / blogs created after this , old posts / blog as don't have track of array

I will recommend to delete all posts & blod from DB to avoid any errorrs