refactor: Clean up the X3DH implementation

example/omemo_dart_example.dart

@@ -1,6 +1,5 @@
-import 'package:omemo_dart/omemo_dart.dart';
+//import 'package:omemo_dart/omemo_dart.dart';
 
 void main() {
-  var awesome = Awesome();
-  print('awesome: ${awesome.isAwesome}');
+  // TODO(PapaTutuWawa): Currently NOOP
 }