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-bearntrail

Open the README and inspect the repository description settings, then compare both URLs with the target URL in the issue. Update each reference so it points to the repository's own game copy, and verify the README and description no longer link to githubschool's copy.

索引モデルが issue の本文から書いたものです。