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-erwin-murillo

更新仓库描述和 README 中的 URL，将 githubschool 复制链接替换为 https://githubschool.github.io/github-games-erwin-murillo。完成的标准是两个位置都指向该确切的游戏 URL；编辑后验证仓库描述和 README。

由索引模型根据 Issue 内容生成。