Can we remove the final folder from the starting code

Hi there,

I was going through the tutorial, which I think is great, but I think I'm spending a lot of time making sure I'm in the right file when starting to edit. We might want to remove the final folder and make it maybe a branch.

The final code is not that useful to compare with an in-progress version either since much changes when you add features in further steps on the tutorial.

检查教程仓库的布局，尤其是起始代码和最终文件夹，并比较两者分别如何支持遵循教程。确定是否应删除最终代码或将其移动到一个分支，然后验证教程仍然易于遵循，并且最终代码仍可用于比较。

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