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-jnijjer/

更新儲存庫描述和 README 中的 URL，這兩處都在 issue 中列出。將連結替換為 https://githubschool.github.io/github-games-jnijjer/，並確認這兩個位置都指向此遊戲副本。

由索引模型根據 Issue 內容生成。