Doc: Update screenshots of New Project and New Wizard dialogs

Rename some screenshots and use them in several places.

Fixes: QTCREATORBUG-27139
Change-Id: I3986a3060710270b4d4400228d4917e83e3183da
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

doc/qtcreator/src/projects/creator-only/creator-projects-creating.qdoc

@@ -80,7 +80,7 @@
     In the first step, you select a template for the project. You can filter
     templates (1) to view only those that apply to a particular target platform.
 
-    \image qtcreator-new-qt-quick-project-wizard.png
+    \image qtcreator-new-project.png
 
     Next, you select a location for the project and specify settings for it.
 
@@ -326,7 +326,7 @@
     \uicontrol {New Subproject}. Follow the steps in the
      \uicontrol {New Subproject} wizard to create a subproject.
 
-    \image qtcreator-new-subproject.png
+    \image qtcreator-new-qt-quick-project.png
 
     To add an existing project as a subproject, select
     \uicontrol {Add Existing Projects} in the context menu.

doc/qtcreator/src/qtquick/creator-only/qtquick-creating.qdoc

@@ -36,7 +36,7 @@
 
     \title Creating Qt Quick Projects
 
-    \image qmldesigner-new-project.png "New Project dialog"
+    \image qtcreator-new-qt-quick-project.png "New Project dialog"
 
     The following table lists the wizard templates for creating a new
     Qt Quick project from scratch.