Add "properties"/gear icon for settings on right side of header

[evangipson]

Also as part of this I'll need to make the dialogue/menu it creates. I'm thinking that it will let you adjust color of the website and dialogues as a baseline.

Also as part of this, I need to implement a "sticky header," so when the user scrolls down to interact with stocks/resources, they can still see the "microstocks" header along the top, and the gear icon to the right or wherever I decide to put it. The height of the header bar shouldn't change, it's just essentially turning into a very stripped down nav. The less animation the better for this one I think,

[evangipson]

This was taken care of with #18.