build: Prepare for docker run

Author: Rafael Bermudez Guijo

frontend/configuration.js

@@ -1,5 +1,5 @@
 // DVB-I Reference installation location -- also backend/configuration.php
-var INSTALL_LOCATION = "http://localhost:8888";
+var INSTALL_LOCATION = "";
 
 // set to true to include <Service> channels that are not included in the selected LCN table.
 var INCLUDE_NON_LCN_CHANNELS = false;