Cope with the fact that servlet-context is no longer working...

At least as I think it did.
Also moved some assets to fixed URLs so that they can be served by Apache, reducing load on Tomcat.

resources/templates/login.html

@@ -11,7 +11,7 @@
 {% endblock %}
 
 {% block content %}
-      <form action="{{servlet-context}}/login" method="post">
+      <form action="login" method="post">
         {% csrf-field %}
         <input type="hidden" name="redirect-to" value="{{servlet-context}}/roles"/>
         <h2>