documentation: Added brief-yoctoprojectqs to mega-manual

The original QS (yocto-project-qs) has been retired for the YP
sumo (2.5) release.  The manual has been replaced with the
brief, two-page quick build document (brief-yoctoprojectqs).

I needed to create a new title figure for the manual to include
as part of the mega-manual (bypqs-title.png).  The figure was
added to the figures folder of both the bried-yoctoprojectqs
and mega-manual book folders.  I also removed the old
ypqs-title.png file that was used for the original QS.

Updated the stylesheet doc for the brief build to include a
style using the new title .PNG file.

Updated the mega-manual.xml file to include the brief doc and
exclude the original QS.

(From yocto-docs rev: aadec4a70fa89e4dcd233c337d8971c8353ee26d)

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

documentation/brief-yoctoprojectqs/brief-yoctoprojectqs-style.css

@@ -118,7 +118,7 @@ h6 {
   background-color: transparent;
   background-repeat: no-repeat;
   padding-top: 256px;
-  background-image: url("figures/ypqs-title.png");
+  background-image: url("figures/bypqs-title.png");
   background-position: left top;
   margin-top: -256px;
   padding-right: 50px;