PDX: Added Github as a gold sponsor.
PDX: Added Github as a gold sponsor.

Former-commit-id: 90421806bfb10bda37b5208973d7bd8001afcb65
masteinhauser/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web,masteinhauser/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web,joelaha/devopsdays-web,benjohnson77/devopsdays-web