SIN-16 welcome: Remove link to 2015 event
SIN-16 welcome: Remove link to 2015 event

It distracts and does not provide any value anymore.

masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,masteinhauser/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,masteinhauser/devopsdays-web,masteinhauser/devopsdays-web