Remove animation on prefers-reduced-motion/low referesh rate devices

Also normalises handling of asset list cable table & improves its use of space on large devices

assets/templates/partials/cable_form.html

@@ -1,5 +1,5 @@
 {% load widget_tweaks %}
-<div class="card">
+<div class="card mb-2">
   <div class="card-header">
     Cable Details
   </div>