getting-started: Removed "concepts.xml" file

This file was for a deeper concepts chapter.  It will go into the
new Yocto Project Concepts Manual.  Removing it required deleting the
*.xml file and updating getting-started.xml to not include it in the
build.

(From yocto-docs rev: 2df213c1cdba8f48918e8240de47c1758352807d)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/getting-started/getting-started.xml

@@ -54,7 +54,7 @@
                <itemizedlist>
                    <listitem><para>
                        This version of the
-                       <emphasis>Yocto Project Overview Manual</emphasis>
+                       <emphasis>Getting Started With Yocto Project Manual</emphasis>
                        is for the &YOCTO_DOC_VERSION; release of the
                        Yocto Project.
                        To be sure you have the latest version of the manual
@@ -86,8 +86,6 @@
 
     <xi:include href="getting-started-development-environment.xml"/>
 
-    <xi:include href="getting-started-concepts.xml"/>
-
 </book>
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