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-pnetiyil/

開啟 repository 描述和 README，然後找出指向 githubschool 遊戲副本的連結。將兩者都更新為 https://githubschool.github.io/github-games-pnetiyil/，並確認每個連結都能解析到這個遊戲副本。

由索引模型根據 Issue 內容生成。