Section-by-Section, Menu-by-Menu Content Overhaul Part One

This is the first part of a multi-part effort to update content of the I2P Web Site working from the navigation menu at the top of the site outward, covering, more-or-less, the first drop-down menu section "About." It updates several of the pages in that section, adds one page, and removes all references to the now dead I2P Browser project. It also updates the footer to include social networking profiles as well.