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-mkosmo

Check the repository description and README for the two existing game URLs. Replace each githubschool copy URL with https://githubschool.github.io/github-games-mkosmo, then verify both links point to this repository's game and that the README renders the corrected link.

索引モデルが issue の本文から書いたものです。