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-Pointma

更新儲存庫描述和 README，這兩個位置就是 issue 中指定的位置。將每個不正確的連結替換為 https://githubschool.github.io/github-games-Pointma，然後檢查兩個連結，確認它們指向此遊戲副本。

由索引模型根據 Issue 內容生成。