Reset income page to just a placeholder for consistency.

lib/pages/income.dart

@@ -7,12 +7,6 @@ class IncomePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Center(
-        child: Column(
-      children: [
-        Text("TBD"),
-        Placeholder(),
-      ],
-    ));
+    return Placeholder();
   }
 }