Add 'Projects' as a top-level menu item

The set of projects that are part of a Working Group is the next level of detail someone would be looking for. Add 'Projects' as a topl-level menu item along side 'About', 'Members', 'Sponsors'. Wayne Beaton has the list of projects.

NOTE: Towards the bottom of the main page, under 'Highlights' section, projects count is listed as 70. So the list that is pointed to by the new menu item shouldn't be far off.