Update index.html.haml
Update about.html.haml
Update index.html.haml
Adds burger menu button with offset
Adds Michael's responsive menu work
updates mobile menu for #96

 - removed side menu since it needed a hack to set the height, and it wasn't working
 - this works well except for when the browser width is between 765 and 960, when the links show up to the right of the logo
brings back nav link underlines in non-mobile view for #96