Old link to Guide on stats.xonotic.org

1. Open https://stats.xonotic.org/
2. Click on "Guide" in the end of the top menu

Result: https://gitlab.com/xonotic/xonotic/wikis/Halogenes_Newbie_Corner is opened

Expected result: http://www.xonotic.org/guide is opened (same behavior as clicking from http://www.xonotic.org/)