Add links to "Build with CMake" page

Change-Id: Id077bcdbebc4cafcc33c1924445232b8f26a103e
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Kavindra Palaraja <kpalaraja@luxoft.com>

doc/src/index.qdoc

@@ -58,7 +58,7 @@
                     \image landing/icon_Tools.png
                     \section1 Tools and Toolchains
                     \l{Internationalization with Qt}{Internationalization} support,
-                    \l{Qt for Embedded Linux}{embedded} toolchains, and more.
+                    \l{Qt for Embedded Linux}{embedded} toolchains, \l{Build with CMake}, and more.
                 \enddiv
                 \enddiv
                 \section1 Licenses Used in Qt

doc/src/reference.qdoc

@@ -51,6 +51,7 @@
     \li \l{Qt Designer Manual}{Qt Designer}
     \li \l{qmake Manual}{qmake}
     \li \l{QDoc Manual}{qdoc}
+    \li \l{Build with CMake}
     \endlist
 
     \section2 Value-Add Features