Add first draft admin interface

This exposes information on Services/Sites/Incidents, but does not yet
permit any changes. Admin page also links to future user management
pages.

source/webui/templates/admin.tpl

@@ -1 +1,37 @@
-TODO
+<h1>Services</h1>
+
+<p>
+    Click on a Service to edit its properties, or access any of the sites defined under it.
+</p>
+
+{if $services}
+    <dl>
+        {foreach from=$services item=service}
+            <dt><a href="{$base_uri}admin/service/id/{$service->id}/" title="Edit site {$service->name|escape:html}">{$service->name|escape:html}</a></dt>
+            <dd>{$service->description|escape:html}</dd>
+        {/foreach}
+    </dl>
+{else}
+    You haven't created any services yet. Create some with the button below.
+{/if}
+
+<form id="admin_addservice" method="post" action="{$base_uri}admin/add-service/">
+    <input type="button" class="btn success" name="addservice" value="Add Service" />
+</form>
+
+
+<h1>Users and Permissions</h1>
+
+<p>
+    Click on a User to edit its properties.
+</p>
+
+<ul>
+    {foreach from=$users item=user}
+        <li><a href="{$base_uri}admin/user/id/{$user->id}/" title="Edit user {$user->username|escape:html}">{$user->username|escape:html}</a></li>
+    {/foreach}
+</ul>
+
+<form id="admin_adduser" method="post" action="{$base_uri}admin/add-user/">
+    <input type="button" class="btn success" name="adduser" value="Add User" />
+</form>