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-JMatchette/

Check the README and the repository description for the existing game URL, then compare them with the target URL stated in the issue. Update both references to use the repository's copy and verify that the README link and description now point to that address.

索引モデルが issue の本文から書いたものです。