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-islaso/

更新 README 中的 URL 和儲存庫描述，使兩者都指向 https://githubschool.github.io/github-games-islaso/。確認每個位置現在都使用所要求的遊戲副本 URL，且不再保留舊的 githubschool 副本連結。

由索引模型根據 Issue 內容生成。