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-ndanturi/

Update the repository description and README, both named in the issue. Start by checking each current URL, replace them with https://githubschool.github.io/github-games-ndanturi/, and verify that both locations point to that copy of the game.

Written by the indexing model from the issue text.