Updated details for Athens node.js meetup. The meetup abides by the node.js CoC (#2066)
Updated details for Athens node.js meetup. The meetup abides by the node.js CoC (#2066)

There was mixup among Germany, Greece and Hungary meetups.
I updated the German section and removed the invalid information from the
Hungarian section.
phillipj/new.nodejs.org,nodejs/new.nodejs.org,yous/new.nodejs.org,nodejs/new.nodejs.org,yous/new.nodejs.org,phillipj/new.nodejs.org