Doc: Remove information about Qt Design Viewer

It has been tightly coupled with Qt Design Studio and
is documented there.

Task-number: QTCREATORBUG-32575
Change-Id: I65b48ad8182bcf040c981419a21eba4b7ff0d894
Reviewed-by: Pranta Ghosh Dastider <pranta.dastider@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

doc/qtcreator/src/qtquick/creator-only/qt-design-viewer.qdoc

@@ -1,39 +0,0 @@
-// Copyright (C) 2024 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
-
-/*!
-    \page qt-design-viewer.html
-    \previouspage creator-how-tos.html
-
-    \ingroup creator-how-to-design
-
-    \title Preview UI prototypes in browsers
-
-    \image qt-design-viewer.png
-
-    Run Qt Quick UI Prototype projects in web browsers, such as Apple Safari,
-    Google Chrome, Microsoft Edge, and Mozilla Firefox, with \QDV.
-
-    The startup and compilation time depend on your browser and configuration.
-    Once started, the application performs the same as when running on the
-    desktop.
-
-    The .qmlproject configuration file defines the main QML file and the import
-    paths. Compress the project folder into a ZIP file that you upload to \QDV.
-
-    The loaded applications remain locally in your browser. No data is uploaded
-    into the cloud.
-
-    To preview an application in a web browser:
-
-    \list 1
-        \li In the browser, open \l{ https://designviewer.qt.io/}{\QDV}.
-        \li Drag your application package to \QDV, or select the load
-            icon to browse for your file.
-    \endlist
-
-    Your application is compiled and run on \QDV.
-
-    \sa {Create Qt Quick UI Prototypes}, {Design UIs}{How To: Design UIs},
-    {UI Design}
-*/