Add global toastify popups

[josephjquinn]

[josephjquinn]

Use toastify (https://fkhadra.github.io/react-toastify/introduction) to add notification / error popups throughout the app

On any create function (ie pets, vet, cargiver ect) toast popup notifying success
On any edit function (ie pets, vet, cargiver ect) Popup notifying success
On any delete function (ie pets, vet, cargiver ect) Popup notifying success

You will need to install the package using npm and import it into every page that uses the popup, see here (https://fkhadra.github.io/react-toastify/installation) for simple example.