Doc: Create a Prototyping chapter

Restructure existing information and fix navigation links.

Fixes: QDS-4470
Change-Id: I4a1118a4620527b461b99bf05b8b06d947018c80
Reviewed-by: Johanna Vanhatapio <johanna.vanhatapio@qt.io>

doc/qtdesignstudio/src/qtquick3d-editor/exporting-3d/exporting-3d-assets.qdoc

@@ -29,7 +29,7 @@
 /*!
     \page exporting-3d-assets.html
     \if defined(qtdesignstudio)
-    \previouspage
+    \previouspage figmaqtbridge.html
     \else
     \previouspage quick-states.html
     \endif
@@ -37,6 +37,17 @@
 
     \title Exporting 3D Assets
 
+    \if defined(qtcreator)
+    \table
+    \row
+        \li \inlineimage blender-logo.png
+        \li \inlineimage maya-logo.png
+    \row
+        \li \l{Exporting from Blender}{Blender}
+        \li \l{Exporting from Maya}{Maya}
+    \endtable
+    \endif
+
     You can import files you created using 3D graphics applications and exported
     to several widely-used formats, such as .blend, .dae, .fbx, .glb, .gltf,
     .obj, .uia, or .uip. For a list of formats supported by each \l{Qt Quick 3D}

doc/qtdesignstudio/src/qtquick3d-editor/exporting-3d/exporting-from-qt3ds.qdoc

@@ -28,7 +28,12 @@
 /*!
     \page exporting-from-qt3ds.html
     \previouspage exporting-from-maya.html
+    \if defined(qtdesignstudio)
     \nextpage studio-importing-designs.html
+    \else
+    \nextpage studio-importing-3d.html
+    \endif
+
     \title Exporting from Qt 3D Studio
 
     Use the following guidelines to achieve the best results when converting

doc/qtdesignstudio/src/qtquick3d-editor/qtdesignstudio-3d-importing.qdoc

@@ -26,12 +26,11 @@
 /*!
     \page studio-importing-3d.html
     \if defined(qtdesignstudio)
-    \previouspage studio-importing-2d.html
-    \nextpage creator-exporting-qml.html
+    \previouspage qtquick-fonts.html
     \else
     \previouspage exporting-from-maya.html
-    \nextpage studio-3d-view.html
     \endif
+    \nextpage creator-exporting-qml.html
 
     \title Importing 3D Assets