Remove unnecessary instance from Burnd Application

app/src/main/java/com/insa/burnd/utils/Burnd.java

@@ -7,21 +7,15 @@
 // Used in this project to deal with all connections in the app, for instance.
 
 public class Burnd extends Application {
-    private static Burnd instance;
     private static Context appContext;
 
     @Override
     public void onCreate() {
         super.onCreate();
-        instance = this;
 
         this.setAppContext(getApplicationContext());
     }
 
-    public static Burnd getInstance() {
-        return instance;
-    }
-
     public static Context getAppContext() {
         return appContext;
     }