ref-manual: Removed the "technical-details.xml" file

Fixes [YOCTO #12370]

The "technical-details.xml" file was for the old chapter four of the
ref-manual.  All content in that chapter has been moved to the new
concepts chapter of the overview-manual.  I updated the mega-manual.xml
file to not include the old technical-details chapter as part of the
ref-manual.  I also updated the ref-manual.xml file to not include the
technical-details.xml chapter when building the ref-manual.

(From yocto-docs rev: c4a88048dc099dbd2d0926a9194d5502fa2f1cfc)

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

documentation/mega-manual/mega-manual.xml

@@ -242,9 +242,6 @@
     <xi:include
         xmlns:xi="http://www.w3.org/2003/XInclude" href="../ref-manual/usingpoky.xml"/>
 
-    <xi:include
-        xmlns:xi="http://www.w3.org/2003/XInclude" href="../ref-manual/technical-details.xml"/>
-
     <xi:include
         xmlns:xi="http://www.w3.org/2003/XInclude" href="../ref-manual/ref-release-process.xml"/>
 

documentation/ref-manual/ref-manual.xml

@@ -172,8 +172,6 @@
 
     <xi:include href="usingpoky.xml"/>
 
-    <xi:include href="technical-details.xml"/>
-
     <xi:include href="ref-release-process.xml"/>
 
     <xi:include href="migration.xml"/>

documentation/ref-manual/technical-details.xml

@@ -1,19 +0,0 @@
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
-[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
-
-<chapter id='technical-details'>
-<title>Technical Details</title>
-
-    <para>
-        This chapter provides technical details for various parts of the
-        Yocto Project.
-        Currently, topics include Yocto Project components,
-        cross-toolchain generation, shared state (sstate) cache,
-        x32, Wayland support, and Licenses.
-    </para>
-
-</chapter>
-<!--
-vim: expandtab tw=80 ts=4
--->