Geometry viewer

docs/howto/geometry_viewer.rst

 Geometry viewer
 ===============
 
+The latest geometry for master branch 
+`is available here <https://eic.phy.anl.gov/geoviewer/index.htm?nobrowser&file=https://eicweb.phy.anl.gov/api/v4/projects/473/jobs/artifacts/master/raw/geo/detector_geo.root?job=report&item=default;1/world_volume/ElectronECAL_11&opt=>`_
+
 .. raw:: html
 
     <embed>
-        <div style="background:red">Hahahahahahaha</div>
+        <div style="background:red">Test red</div>
         <script>
             console.log("hahaha");
         </script>