Update Tutorial

[djfjfofoc3]

Describe the bug
Currently, the tutorial is still on version 1.x.x - It should be updated to 2.x.x

To Reproduce
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Expected behavior
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Screenshots

Desktop (please complete the following information):
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Additional context
Add any other context about the problem here.

[mslowin]

Yup, I tried using WPF-UI for the first time today and I just couldn't get it to work. The tutorial really needs an update 😄