Reference git.o.o DevStack repo rather than GitHub

In docs, use git.o.o URLs rather than GitHub URLs for the DevStack repo,
and don't mention GitHub when git.o.o is more appropriate.
Also, replaced GitHub logo with Git logo in quickstart.png.

Change-Id: Iab0006144f008963b8cb5be2d10ce0f360c0e6ca
diff --git a/doc/source/faq.html b/doc/source/faq.html
index 2c74a66..7cbb9d2 100644
--- a/doc/source/faq.html
+++ b/doc/source/faq.html
@@ -34,7 +34,7 @@
             <li><a href="overview.html">Overview</a></li>
             <li><a href="changes.html">Changes</a></li>
             <li><a href="faq.html">FAQ</a></li>
-            <li><a href="http://github.com/openstack-dev/devstack">GitHub</a></li>
+            <li><a href="https://git.openstack.org/cgit/openstack-dev/devstack">git.openstack.org</a></li>
             <li><a href="https://review.openstack.org/#/q/status:open+project:openstack-dev/devstack,n,z">Gerrit</a></li>
           </ul>
         </div>
@@ -73,7 +73,7 @@
             <dd>A: DevStack is optimized for documentation &amp; developers.  As some of us use <a href="https://github.com/dellcloudedge/crowbar">Crowbar</a> for production deployments, we hope developers documenting how they setup systems for new features supports projects like Crowbar.</dd>
 
             <dt>Q: I'd like to help!</dt>
-            <dd>A: That isn't a question, but please do!  The source for DevStack is <a href="http://github.com/openstack-dev/devstack">github</a> and bug reports go to <a href="http://bugs.launchpad.net/devstack/">LaunchPad</a>.  Contributions follow the usual process as described in the <a href="http://wiki.openstack.org/HowToContribute">OpenStack wiki</a> even though DevStack is not an official OpenStack project.  This site is housed in the CloudBuilder's <a href="http://github.com/cloudbuilders/devstack">github</a> in the gh-pages branch.</dd>
+            <dd>A: That isn't a question, but please do!  The source for DevStack is at <a href="https://git.openstack.org/cgit/openstack-dev/devstack">git.openstack.org</a> and bug reports go to <a href="http://bugs.launchpad.net/devstack/">LaunchPad</a>.  Contributions follow the usual process as described in the <a href="http://wiki.openstack.org/HowToContribute">OpenStack wiki</a> even though DevStack is not an official OpenStack project.  This site is housed in the CloudBuilder's <a href="http://github.com/cloudbuilders/devstack">github</a> in the gh-pages branch.</dd>
 
             <dt>Q: Why not use packages?</dt>
             <dd>A: Unlike packages, DevStack leaves your cloud ready to develop - checkouts of the code and services running in screen. However, many people are doing the hard work of packaging and recipes for production deployments.  We hope this script serves as a way to communicate configuration changes between developers and packagers.</dd>