Improved pipeline headers

On May 22, 2017, Buildkite introduced upgrades to its pipeline header. The updated version includes a quick link to your source code repository, improved support on smaller screens, and enhanced emoji functionality. The new pipeline header is now accessible from mobile devices and supports all types of emojis in pipeline names and descriptions. Additionally, the "New Build" dialog has been improved for better user experience. These changes are powered by React and GraphQL technologies and can be viewed in the open-source buildkite/frontend GitHub repository.