Use Qt.createComponent to replace dedicated AboutPage.qml
This MR ports KWeather to use Kirigami-Addons to create the AboutPage FormCard using Qt.createComponent
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Kirigami-Addons I believe is already being used, and it came up in another MR that Kirigami-Addons depends on QtMultimedia, but since Kirigami-Addons is already being used I don't think this will be a problem.
Let me know if any further changes are needed. Thanks!