Make rules with -- eg same-license--file appear lighter in appendix table

Not needed elsewhere eg license view because actual rule is spelled out
and no distinction with other licenses with non-attenuated versions of
the rules is useful for eyeballing

Some visual cue other than .5 opacity might be more useful, eg smaller
or not filled in circle, but this is easy first cut given current sprite
setup

appendix.md

@@ -42,7 +42,12 @@ If you're here to choose a license, **[start from the home page](/)** to see a f
         {% for r in license[t] %}
           {% if r contains req %}
             <td class="license-{{ t }}" style="text-align:center">
-              <span class="{{ r }}">
+              {% if r contains "--" %}
+                {% assign lite = " lite" %}
+              {% else %}
+                {% assign lite = "" %}
+              {% endif %}
+              <span class="{{ r | append: lite }}">
                 <span class="license-sprite {{ r }}"></span>
               </span>
             </td>

assets/css/application.scss

@@ -254,6 +254,7 @@ strong {
 .license-limitations span { background-position: -16px 0; width: 12px; height: 12px; }
 .license-permissions span { background-position: -28px 0; width: 12px; height: 12px; }
 .license-conditions span  { background-position: -40px 0; width: 12px; height: 12px; }
+.lite span { opacity: 0.5; }
 
 .license-rules-sidebar li {
   float: none;