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In this section of the flutter app development series, we will make an onboarding screen and apply it to our app. We'll install GoRouter, Provider, Shared_Preferences and Shared_Preferences packages. If the user/app has been onboarded, then no need to onboard until the lifetime of the application i.e.e until the app is uninstalled.- If no, then go to the onboarding page just once and then never in the app's lifetime.