UI (#15)

Adding new Admin UI. Updating Fredy to V3.0.0 as it has been a large rewrite. Thanks for all contributions and help on the way!

ui/src/components/toasts/ToastContext.js

@@ -0,0 +1,7 @@
+import { createContext } from 'react';
+
+const CheckoutDrawerContext = createContext({
+  showToast: () => {},
+});
+
+export default CheckoutDrawerContext;