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-KhamjaniHG

更新 repository 描述和 README，使两个 URL 都指向 https://githubschool.github.io/github-games-KhamjaniHG。检查每个位置的当前链接，替换过时的目标，并验证两个链接都能解析到 repository 中的游戏副本。

由索引模型根据 Issue 内容生成。