dev-manual: Removed Toaster development flow

Fixes [YOCTO #11630]

Took the small reference section out for developing an image
using toaster.  This was just a pointer to the toaster manual.

(From yocto-docs rev: 8dcce4411aaa5d1d8fe2c809166a947d0e38a97b)

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

documentation/dev-manual/dev-manual-model.xml

@@ -30,13 +30,6 @@
              steps to get the changes upstream and applied in the affected
              recipes.
              </para></listitem>
-         <listitem><para><emphasis>Image Development using Toaster:</emphasis>
-             You can use <ulink url='&YOCTO_HOME_URL;/Tools-resources/projects/toaster'>Toaster</ulink>
-             to build custom operating system images within the build
-             environment.
-             Toaster provides an efficient interface to the OpenEmbedded build
-             that allows you to start builds and examine build statistics.
-             </para></listitem>
          <listitem><para><emphasis>Using a Development Shell:</emphasis>
              You can use a
              <link linkend='platdev-appdev-devshell'><filename>devshell</filename></link>
@@ -1245,20 +1238,6 @@
     </section>
 </section>
 
-<section id='image-development-using-toaster'>
-    <title>Image Development Using Toaster</title>
-
-    <para>
-        Toaster is a web interface to the Yocto Project's OpenEmbedded build
-        system.
-        You can initiate builds using Toaster as well as examine the results
-        and statistics of builds.
-        See the
-        <ulink url='&YOCTO_DOCS_TOAST_URL;#toaster-manual-intro'>Toaster User Manual</ulink>
-        for information on how to set up and use Toaster to build images.
-    </para>
-</section>
-
 <section id="platdev-appdev-devshell">
     <title>Using a Development Shell</title>