Doc: Move sidebar view docs into separate topics

- Link the topics from "Show and hide sidebars"
- Hide "Working in Edit Mode" from QDS because the Edit mode is
  hidden by default there
- Fix links to the new topics and remove links to
  "Browsing Project Contents"

Task-number: QTCREATORBUG-29361
Change-Id: Ia9ae6474bf0925a76f9ccee693369d2460b9266f
Reviewed-by: Mats Honkamaa <mats.honkamaa@qt.io>

doc/qtcreator/src/user-interface/creator-ui.qdoc

@@ -82,7 +82,6 @@
     For information about new features and bug fixes in each \QC release,
     select \uicontrol Help > \uicontrol {Change Log}.
 
-    \sa {Show and hide sidebars}, {Browsing Project Contents}
     \sa {Use the UI}{How-to: Use the UI}
 
     \else
@@ -145,7 +144,7 @@
 /*!
     \page creator-output-panes.html
     \if defined(qtdesignstudio)
-    \previouspage creator-views.html
+    \previouspage creator-editor-functions.html
     \nextpage creator-highlighting.html
     \else
     \previouspage creator-open-documents-view.html