add markdown-to-json (m2j) plugin to not replicate speakers data
deactivate from supporters img-responsive so logos are centered
share the same navbar partial between all pages using helpers (fixes navbar in sponsorship)
fix table style
make sponsor table clearer about not included things
add exits section, so people can keep inside
hide shirts, so we do not know if we made it
make sponsor table easier to read
add big nice tasty button to become sponsor (+ some refactor)
fix exits on mobile phones