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-cyberesc

Update the URL in the repository description and README to https://githubschool.github.io/github-games-cyberesc. Verify that both locations point to the repository's copy of the game and that the README link resolves correctly.

索引モデルが issue の本文から書いたものです。