After doing thorough testing on mobile I have scrapped my original
flexbox design in favor of sticky headers. I will not be implmenting a
bottom toolbar like twitter. Instead I will find another way to add user
tools in mobile mode. This approach works better on desktop as well.
Let's simplify and use new CSS tools we have to our advantage and make a
unified design that works on both desktop and mobile better.
* Created directory for UI
* Moved rendering code to js/ui/render.js
* Created initial js/ui/util.js for UI utilities
Notice I did not use modules. I was thinking of doing this but I am
avoiding it for now as it is much easier to just have everything
declared as global at this time. For onclick methods this makes sense;
but for code (such as rendering) I think it would be better off as a
module that gets imported. This is a task for another day.
