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-RituLumen

更新 README 和仓库描述中的 URL，将 https://githubschool.github.io/github-games-RituLumen 用作目标。之后检查这两个位置，确认它们指向此游戏副本。

由索引模型根据 Issue 内容生成。