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-axs20618

更新仓库描述和 README 中的 URL，使其指向 https://githubschool.github.io/github-games-axs20618，而不是 githubschool 的副本。验证两个链接都能解析到此仓库的游戏，并确保 README 仍能正确渲染。

由索引模型根据 Issue 内容生成。