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-hzhang2015/

Start by opening the README and checking the repository description settings. Locate both links that point to GitHub School's copy, change them to https://githubschool.github.io/github-games-hzhang2015/, and verify that the README and description show the corrected URL.

索引モデルが issue の本文から書いたものです。