Update navigation of *PNI

[alanmoo]

Redpen: https://redpen.io/p/ajf2da463e476f3864

[natalieworth]

@gvn @alanmoo This slipped off my radar, but we'll have to update the image that gets shared on the PNI site. @beccaklam and I want to use this one: https://drive.google.com/drive/u/1/folders/13qllPp4vO6VikJEkC5dUS-wb_ltxhLw3

[gvn]

@natalieworth since that's unrelated to this ticket (this is just for the nav update) can you file a separate ticket to change the image?

[natalieworth]

yeah defs