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-stefanscheidt/

Update the repository description and the README referenced in the issue. Check both existing URLs first, then confirm they point to https://githubschool.github.io/github-games-stefanscheidt/ and review the rendered README and repository page to verify the links are correct.

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