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-ptercodefu

更新 repository 描述和 README 中的 URL，将指向 githubschool 副本的链接替换为 https://githubschool.github.io/github-games-ptercodefu。编辑后检查这两个位置，并确认它们指向 repository 中的游戏副本。

由索引模型根据 Issue 内容生成。