sysadmin: Use norwich style, add shims for new guides

system-admin-guide/C/appearance.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="appearance">
+<info>
+<link type="guide" xref="index" group="appearance"/>
+</info>
+<title>Appearance</title>
+</page>

system-admin-guide/C/index.page

@@ -31,6 +31,9 @@
 
 <title>GNOME Desktop System Administration Guide</title>
 
+<links style="norwich" type="topic"
+       groups="user-settings appearance #first #default #last"/>
+
 <section style="toronto" id="user">
   <title>User settings</title>
 </section>

system-admin-guide/C/login.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="login">
+<info>
+<link type="guide" xref="index"/>
+</info>
+<title>Login</title>
+</page>

system-admin-guide/C/network.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="network">
+<info>
+<link type="guide" xref="index"/>
+</info>
+<title>Network</title>
+</page>

system-admin-guide/C/setup.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="setup">
+<info>
+<link type="guide" xref="index"/>
+</info>
+<title>Setup</title>
+</page>

system-admin-guide/C/software.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="software">
+<info>
+<link type="guide" xref="index"/>
+</info>
+<title>Software</title>
+</page>

system-admin-guide/C/sundry.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="sundry">
+<info>
+<link type="guide" xref="index" group="#last"/>
+</info>
+<title>Sundry</title>
+</page>

system-admin-guide/C/troubleshooting.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="troubleshooting">
+<info>
+<link type="guide" xref="index"/>
+</info>
+<title>Troubleshooting</title>
+</page>

system-admin-guide/C/user-settings.page

+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="user-settings">
+<info>
+<link type="guide" xref="index" group="user-settings"/>
+</info>
+<title>User Settings</title>
+</page>