URL in description and README broken

The URL in the repository description and 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-rd-torsten-heym/

更新仓库描述和 README，这两个位置就是 issue 中提到的位置。将失效的游戏 URL 替换为 https://githubschool.github.io/github-games-rd-torsten-heym/，并确认这两个位置都指向此副本。

由索引模型根据 Issue 内容生成。