Completed FirstTimeUseScreen with Final UX Look (#812)

* Forced Project Manager window to 1200x800

* Final look for FirstTimeUseScreen, essentially complete

* Remove margins on screens

* Added License info for image

Code/Tools/ProjectManager/Source/ScreensCtrl.cpp

@@ -22,6 +22,9 @@ namespace O3DE::ProjectManager
         : QWidget(parent)
     {
         QVBoxLayout* vLayout = new QVBoxLayout();
+        vLayout->setMargin(0);
+        vLayout->setSpacing(0);
+        vLayout->setContentsMargins(0, 0, 0, 0);
         setLayout(vLayout);
 
         m_screenStack = new QStackedWidget();