Do not use XHTML-style self-closing tags in the templates

This makes the documents more correct, although there are still
some other problems.

Signed-off-by: Julian Andres Klode <jak@debian.org>

deblayout/templates/debian-base.html

@@ -11,7 +11,7 @@
     {% endblock %}
 
     {% block head_resources %}
-      <link type="text/css" rel="stylesheet" media="all" href="{{ MEDIA_URL }}css/debian.css" />
+      <link type="text/css" rel="stylesheet" media="all" href="{{ MEDIA_URL }}css/debian.css">
     {% endblock %}
   {% endblock %}
 </head>

nmlayout/templates/nm-base.html

@@ -10,7 +10,7 @@
 
 {% block head_resources %}
   {{block.super}}
-  <link type="text/css" rel="stylesheet" media="all" href="{{ MEDIA_URL }}css/nm.css" />
+  <link type="text/css" rel="stylesheet" media="all" href="{{ MEDIA_URL }}css/nm.css">
 {% endblock %}
 
 {% block section %}<a href="{% url home %}">NM</a>{% endblock %}