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-SSilver9/

Open the repository README and GitHub repository description, then compare their game URLs with the target URL in the issue. Update both references to point to the repository's own GitHub Pages copy, and verify that the displayed links resolve to the specified address.

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