dev-epau.archi.fr/user/themes/antimatter/hebe.json

{
   "project":"grav-theme-antimatter",
   "platforms":{
      "grav":{
         "nodes":{
            "theme":[
               {
                  "source":"/",
                  "destination":"/user/themes/antimatter"
               }
            ]
         }
      }
   }
}