Allow for an extensible UI through overrides

[bravecobra]

Looking at how you can extend the UI for Identity, I would suggest using a similar approach.

https://docs.microsoft.com/en-us/aspnet/core/security/authentication/customize-identity-model?view=aspnetcore-3.0#customize-the-model

This code is then to provide a UI nuget package, adding the default UI, but the user is able to override that UI in their own projects without having to hack customization into the existing code, which they are now able to do. This makes upgrades difficult if you used the template approach.