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-KFITZG/

更新 repository 描述和 README 中的 URL，使二者都指向 https://githubschool.github.io/github-games-KFITZG/。在 GitHub 上查看时，确认描述和 README 各自显示 repository 自有的游戏 URL。

由索引模型根据 Issue 内容生成。