* Make landing page responsive
* Use QtCreator welcome page theme colors
* Remove CMake from landing page
* Separate colors from values to make mocking data less redundant
* Add quick version to qt version check
* Use qml singleton for backend instead of using the root context item
Change-Id: Ic303d4713c348e34197716031b303720702f3e98
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>