T2207
Implement a non-antd notification component for Cashtab
Went with `react-toastify` as
- it looks great
- it is well supported
- it "just works" out of the box, with the same API as antd
- A custom notification component actually is a pretty big job if you want it to look good. No need to reinvent the wheel.
I'm sure toastify will have things I dislike but it won't consume the entire app like antd has.