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-bonediggidy

检查 repository 描述和 README，找出两个过时的链接。将两者都更新为 https://githubschool.github.io/github-games-bonediggidy，然后验证 repository 描述和 README 是否指向游戏自己的副本。

由索引模型根据 Issue 内容生成。