Updated config to fix clear text errors

A net::ERR_CLEARTEXT_NOT_PERMITTED occured when using the app on android
phone, we have to force the android to allow the communication to fix
the problem.
More info : https://stackoverflow.com/a/54752717/10736081

Also fixed a problem with the images path when running the app on
mobile.

mobile/www/js/routes.js

@@ -25,7 +25,7 @@ routes = [
                                                        : char.firstName;
 
                     $$("#title-char").text(charFullName);
-                    $$("#picture-char").attr("src", "/img/characters/" + char.firstName + ".png");
+                    $$("#picture-char").attr("src", "img/characters/" + char.firstName + ".png");
                     actualCharId = charId;
                     createTableOfStats();
                     displayTableOfGrowthRates();