Update Welcome Page
Update Welcome Page

Remove comment tags to reveal some sections;
Update Twitter to reflect current twitter account


Former-commit-id: 61499cd02e1315ec334a0fa9ba904923cc97cfb2
masteinhauser/devopsdays-web,joelaha/devopsdays-web,joelaha/devopsdays-web,joelaha/devopsdays-web,masteinhauser/devopsdays-web,masteinhauser/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web