FR-26: Mark Property as not Favourite

Description

As an authenticated user, I want to remove an advertisement from my favourites list so I can keep the list clean of advertisements I am no longer interested in.

Context

This is linked to #24 (closed). Should be done together.

Acceptance Criteria

• AC1 - An authenticated user should be able to remove the favourite from an advertisement on the home listing page (/).
• AC2 - An authenticated user should be able to remove the favourite advertisement from the detailed advertisement page (/properties/:reference).
• AC3 - The star icon should change to non-filled one after sucessfully removing it from favourites.
• AC4 - The page should not refresh after removing the favourite.
• AC5 - The user should see a flash notifying them of a successful unfavourite action.

Dependencies

Requires #18 (closed)

Requires #24 (closed)