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-K-Lemming/

打开仓库 README 并检查仓库描述设置。将两个 URL 更新为 https://githubschool.github.io/github-games-K-Lemming/，并确认 README 链接和描述现在都指向此仓库的游戏副本。

由索引模型根据 Issue 内容生成。