Now they are going to show json, xml, yaml, graphviz, audio files, video files, display docx, xlsx, pptx, prettify your minified code, build a database for you from SQL backups and let you query it, set up an environment from your .env files and give you a shell prompt, show you a rendered DOM from your HTML files and virtual dom declarations, display structured data from microformats, microdata and json-ld, let you query structured data from inside files so GitHub can be really used as a database, deploy your app, run your code and search for actual and potential errors, find your lost TV remote, wash your car and cook your dinner.
This is partly serious and I think GitHub is awesome.