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-bterrific2008/

检查 repository 描述和 README，找到两个过时的链接。将每个 URL 更新为该 repository 自己的 GitHub Pages 游戏 URL，然后验证描述和渲染后的 README 显示预期的目标位置。

由索引模型根据 Issue 内容生成。