Edit Item Post Frontend

[rebecca-123]

• Note: this is a larger issue so no worries if you aren't able to finish by this week's meeting
• Add an "EDIT" button that displays only for the creator of the item

• When the button is clicked, a new modal should pop up and allow the user to update the item info
  • The model should be similar to the CreateModal we currently have, but for updating the existing item info