[Suggestion]: Improve code in Tic-Tac-Toe demo

Summary

I believe there's a good scope to improve the code in the Tic-Tac-Toe example here.

Page

https://react.dev/learn/tutorial-tic-tac-toe

Details

• The Board component returns the Square component statically. This could instead be returned dynamically using the map method. This will also be a good way to demonstrate the key prop.
• Talking about the styling, instead of defining a board-row class that puts each box in a row, we can instead use a grid container with 3 columns and fit-content width.
• Instead of attaching a click listener to each box, the click event handling can be delegated to the parent container.

Open the Tic-Tac-Toe tutorial at https://react.dev/learn/tutorial-tic-tac-toe and review the Board, Square, and styling examples. Update the demo to generate squares with map and demonstrate key, use a three-column grid, and delegate clicks to the parent container; the tutorial should remain understandable and functional.