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-frkfxn01/

Update the URL in the README and the repository description so both point to https://githubschool.github.io/github-games-frkfxn01/. Check the rendered README and repository page to confirm the links now reference this game's copy.

索引モデルが issue の本文から書いたものです。