URL in description and README broken

The URL in the repository description and the one in the README are pointing to githubschool's copy of the game instead of yours.

Please fix both so they point to your copy of the game at https://githubschool.github.io/github-games-jzhangab/

更新仓库描述和 README，它们目前都指向 githubschool 的副本。将每个 URL 更改为 https://githubschool.github.io/github-games-jzhangab/，并验证这两个位置都显示仓库自己的游戏 URL。

由索引模型根据 Issue 内容生成。