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-Rickter2u/

Inspect the repository description settings and the README, which are the two locations named in the issue. Update both links to the provided project URL, then verify that each link resolves to this repository's game page.

索引モデルが issue の本文から書いたものです。