Delete a Goal

[danielbuva]

Users need a way to delete their own goal for when they are regret what they posted!

Backend:

• DELETE route that uses goalId in url params to remove record from db
• successful response is a message sharing that the response was successful
• error response is 404 when goal is not found based on id and share that too :)

Frontend:

• goals have the three dots dropdown menu button (see wireframe), which has a delete option
• delete option opens confirmation modal (see wireframe)
• confirming deletes it!