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-dcampillo87/

Review the repository description and README to locate the outdated game URLs. Replace both references with https://githubschool.github.io/github-games-dcampillo87/ and verify that the links resolve to this repository's copy of the game.

索引モデルが issue の本文から書いたものです。