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-tuonghoanggithub

Update the URL in the repository description and in the README. Verify that both point to https://githubschool.github.io/github-games-tuonghoanggithub and confirm the README link resolves correctly.

由索引模型根據 Issue 內容生成。