Updated user unfollow and itemshop buying endpoints

[AdityaK2905]

Updated the following endpoints:

• PUT /user/unfollow/ with { eventId: "event1"} to DELETE /user/unfollow/event1/

  • Passes event id to unfollow as path parameter instead of as the body and changes method to DELETE

• POST /shop/item/buy/ returns { name: "Jacket", ..all additional item properties } instead of { itemName: "Jacket" }

  • Returns the full information of the item bought instead of just itemName, which changes item name to be under name instead of itemName