Replace icons of sample project

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The current icons of the second project sample are released under the Creative Commons Attribution 4.0. The icons could be changed to something more meaningful and have a different license attribution to prevent having to credit the author everywhere.

[end2endzone]

Using the icons from the Very Basic set of Icons8 Flat Color Icons seems a good candidate. Theses icons are licensed under the Good Boy License which does not require to credit the author everywhere.