Hamburger updates

[staylor]

From Michelle, via email

just happened to see this - it's the burger/X animation I had in mind.

• our burger icon could be a little smaller/thinner I think too

https://jesstravels.net/2017/04/18/volunteering-at-costa-rica-animal-rescue-center/

[staylor]

I made the icon smaller - I am going to move this into the backlog, will work on the animation later