fix(notifications): use toast instead of alertify

[magicznyleszek]

💭 Notes

Mistakingly import { notify } from 'alertifyjs' was being used instead of import { notify } from 'js/utils'. I've added some deprecation tags to alertify related code. Note that our notify (it uses react-hot-toast) might get deprecated soon too - in favor of Mantine's notifications system.

👀 Preview steps

Bug template:

1. ℹ️ have two accounts: "joe" and "bo"; "joe" is org owner, "bo" is not
2. send invite from "joe" to "bo" for joining joe's organization
3. remove invitation
4. 🔴 [on main] notice that the notification appears in bottom right corner and it looks different
5. 🟢 [on PR] notice that the notification appears in top center and it looks as it should :)