Add CC-BY-NC-SA license to site footer

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   font-size: .75em; }
 
 body > footer {
+  color: #586e75;
   font-size: .8em; }
+body > footer img.cc {
+  height: 1.25em !important;
+  margin-left: 3px;
+  vertical-align: text-bottom; }
 
 .system {
   font-family: fleurondingbats;

 </aside>
 
 <footer style=display:none id=loading>loading</footer>
+<footer><a
+href=http://creativecommons.org/licenses/by-nc-sa/4.0 target=_blank
+rel="license noopener noreferrer" style=display:inline-block
+title="Attribution-NonCommercial-ShareAlike 4.0 International">
+<img class=cc src=/static/cc.svg> <img class=cc src=/static/by.svg>
+<img class=cc src=/static/nc.svg> <img class=cc src=/static/sa.svg>
+</a></footer>
 
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