### TL;DR
Removed the dependency on `react-hot-toast` in favor of a custom implementation for toast notifications.
### What changed?
1. Removed `react-hot-toast` from `package.json` and `yarn.lock`.
2. Updated `EnvironmentVariables` and `Config` to use the custom toast notification system.
### Why make this change?
To reduce bundle size and have more control over the toast notification system.
### How to test?
1. Navigate to the Environment Variables settings for a project. Try adding and removing environment variables to see the new toast notifications in action.
2. Navigate to the Domains settings for a project and try adding a new domain to view the custom toast notifications.
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