Fix copyright date, Bonn lecture date, tweak navbar style
The copyright date in the footer is updated from 2017 to 2018, and the Bonn lecture date is fixed to be 2017 instead of 2016. The navbar links are now 85% opaque until they're hovered over.
The copyright date in the footer is updated from 2017 to 2018, and the Bonn lecture date is fixed to be 2017 instead of 2016. The navbar links are now 85% opaque until they're hovered over.