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-saikothuru

更新儲存庫描述和 README 中的 URL，使兩者都指向 https://githubschool.github.io/github-games-saikothuru。完成變更後，驗證這兩個位置的連結。

由索引模型根據 Issue 內容生成。