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-dchang1525

Update the repository description and the URL in README so both point to https://githubschool.github.io/github-games-dchang1525 instead of githubschool's copy. Verify the description and README each show the repository's own game URL; the issue provides no additional test or file path.

索引モデルが issue の本文から書いたものです。