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，將指向 githubschool 副本的連結替換為 https://githubschool.github.io/github-games-ptercodefu。編輯後檢查這兩個位置，並確認它們指向 repository 中的遊戲副本。

由索引模型根據 Issue 內容生成。