URL in description and README broken

The URL in the repository description and 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-pauloppais/

更新仓库描述和 README，这两处是 issue 中提到的位置。将指向 githubschool 副本的链接替换为 https://githubschool.github.io/github-games-pauloppais/。完成标准是两处都指向仓库自己的游戏 URL。

由索引模型根据 Issue 内容生成。