Show alert if the app is launched from folders (which is not a /Applications folder)

Descripotion

In order to install the Network Extension, the main app needs to be launched from /Applications/ folder. If not, we can't install it. It's just a silent failed without error

Criteria

• Detect if the app is launched, which is not from the /Applications -> Show big alert and tell the user to drag the app to /Applications Folder. Review the LuLu Source code, I remember I read this logic in the AppDelegate.m
• Minor update: If the Network Extension fails for any reason with

networkExtensionStatus = .error(errorMessage)

Please show the error alert in the main view too -> With the error. -> 2 buttons, OK and Open Bug ticket -> Click will open the Github Page