Revert "Update banner with latest GraphQL Berlin Meetup (#1380)" (#1398)
Revert "Update banner with latest GraphQL Berlin Meetup (#1380)" (#1398)

This reverts commit c18277f8f3dfeab424a5618d7ec40650d711430d.
howtographql/howtographql,howtographql/howtographql,howtographql/howtographql