GitHub.com has introduced an updated site header to improve navigation and streamline user access to key features. The new header enhances the user experience by providing quicker access to dashboards for pull requests and issues from any page on the site, allowing users to efficiently track open tasks, mentions, and assignments across their projects. Additionally, clicking on the user avatar now reveals a dropdown menu with direct links to the user's profile, account settings, and a new "Your stars" link for easy access to starred repositories. These updates aim to simplify project management and enhance overall usability for GitHub users.