Rework or remove the hardcoded application structure

[Artem-Semenov-dev]

The application's structure, including the menu and header, is currently hardcoded within the Chords Application component. This design restricts customization and modification, limits flexibility, and makes it hard to meet different application needs. The proposed solution is to refactor relevant components to enable a more dynamic and configurable structure or remove the built-in application structure entirely, transferring the responsibility of making it to the user.