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-jsavella

先開啟儲存庫描述和 README。將兩個 URL 都更新為指向 https://githubschool.github.io/github-games-jsavella，然後確認儲存庫描述和 README 是否都連結到此網址。

由索引模型根據 Issue 內容生成。