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-okalluru54/

Update the repository description and the URL in README so both point to https://githubschool.github.io/github-games-okalluru54/. Verify that each location now uses the game copy's URL and that no link still points to githubschool's generic copy.

索引モデルが issue の本文から書いたものです。