Update file safety.html

wiki/pages/safety.html

 {% extends "layout.html" %} {% block page_content %}
 <style>
   header.description {
-    background: url("https://static.igem.wiki/teams/4653/wiki/results/head-picture/head-picture/safety.jpeg")
+    background: url("https://static.igem.wiki/teams/4653/wiki/results/head-picture/head-picture/safety-1.jpeg")
       no-repeat bottom center/cover;
   }
 </style>