remove Jeffrey from speaker list
remove Jeffrey from speaker list


Former-commit-id: 52b540fb45ad907b6abd72bc161e4cb52ef23386
joelaha/devopsdays-web,joelaha/devopsdays-web,joelaha/devopsdays-web,benjohnson77/devopsdays-web,masteinhauser/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web