Hastily styled workshop/hackathons section

Hastily styled this section. Split into two 50% wide left-right
sections (looks unbalanced, shift both sides towards center more). Both
floated, so height is set in “.city” (media queries to adapt).
Background probably will be changed later, since it looks ugly and the
text is unreadable (or overlay a semi-opaque white box?). Feel free go
ahead and fix - this is just a rough placement.