Minor improvements to the civicrm.org website

During the last few hours of the Civi Sprint in London, Jen (who is new to Civi) and I had a look at some basics on the CiviCRM website (civicrm.org) and have identified some problems and possible solutions.  Noting too radical mind and most involve minimal changes to the actual content as that's perhaps for a later date.

Home page

Problem: Presented with too many options: Primary navigation, secondary navigation, left hand list of Civi components
Solution: Remove left hand list of Civi components