Implement Routing for "Start New Game" Feature

[ElenaBarker]

• Implemented routing for the "Start New Game" feature.
• Created a new route in App.js to handle the rendering of components related to starting a new game.
• Used the Routes and Route components from react-router-dom to define the route structure.
• Added corresponding components (DummyWordHolder, HolderForWrongLetters, DummyInputHolder) to be rendered when the "Start New Game" route is accessed.
• Ensured that the components are wrapped in a Box with appropriate styling.