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-opaliivets

Inspect the repository description and README, then compare both URLs with the target URL given in the issue. The work is done when both locations point to https://githubschool.github.io/github-games-opaliivets and no longer point to the shared copy.

Scritto dal modello di indicizzazione a partire dal testo della issue.