SO MANY SPEAKERS!

- Added the majority of the speakers. Still need to add the keynotes & workshops.
- Refactored the hexagons like an angry pandabear trying to get at some bamboo. Abstracted out the speakers into YAML files to make things easier to iterate over. Added some basic automation so I just have to add a speaker image and things magically start working. Cleaned up the CSS for the hexagons. It was pretty hackish. Yay nth-child.