Adds graphics improvements

* Adds Open Sans as default font
* Adds HTML to search form on the top
* Removes "social icons" from the top
* Adjusts navigation menu (top) with new color palette (Adobe Kuler):
  * rgb(50, 76, 93)
  * rgb(70, 77, 157)
  * rgb(239, 201, 76)
  * rgb(227, 121, 63)
  * rgb(193, 33, 34)
* Adds logo