Some front end prettifications and tweaks

Major changes:
* Moved some nav items (help, my progress) into a dropdown
* Put a margin-top on the sidebar so that it no longer covers the logo / nav items 
* Turned the top nav into tabs to make it more obviously clickable 
* made forms for creating facility users (which includes sign up) and log in forms a bit more clickable by increasing button size and coloring them green 

![learn ka lite - google chrome_114](https://cloud.githubusercontent.com/assets/1319950/4729643/0f2e7c94-598b-11e4-9dc3-d51b73fcc036.png)
![selection_116](https://cloud.githubusercontent.com/assets/1319950/4729649/3272992e-598b-11e4-84ea-e276e1263b7b.png)
Can see better in this one what I was going for -- this gets rid of the awk tiny username/points gray thing we had going on 
![selection_117](https://cloud.githubusercontent.com/assets/1319950/4729656/4f46d04c-598b-11e4-994f-d220bd6d6c80.png)
and also saves some space by putting away less frequently used stuff like help. 
![log in ka lite - google chrome_118](https://cloud.githubusercontent.com/assets/1319950/4729672/994bbf22-598b-11e4-9217-11881940e3c9.png)