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-RachelDillinger

先檢查儲存庫描述和 README，這兩處是 issue 中提到的位置。將兩個 URL 都更新為指定的遊戲文案，然後確認每個連結都能解析到儲存庫的 GitHub Pages URL。

由索引模型根據 Issue 內容生成。