Feedback entry hidden.

Not implementing jet.

app/src/main/res/layout/activity_settings.xml

@@ -295,7 +295,8 @@
                 android:layout_marginLeft="15dp"
                 android:layout_marginRight="15dp"
                 android:layout_marginStart="15dp"
-                android:layout_marginEnd="15dp"/>
+                android:layout_marginEnd="15dp"
+                android:visibility="gone"/>
 
             <LinearLayout
                 android:orientation="vertical"
@@ -303,7 +304,8 @@
                 android:layout_height="match_parent"
                 android:id="@+id/ll_settings_feedback"
                 android:padding="10dp"
-                android:layout_marginBottom="5dp">
+                android:layout_marginBottom="5dp"
+                android:visibility="gone">
 
                 <TextView
                     android:text="@string/preferences_info_feedback"