Website updates:

• June 22, 2020 Added Comsol MultiPhysics training link, created the vendors page, removed all 1270 special topics links and made them ECE-1890, added spark fun tutorials on schematic and board layout links, various other minor edits in text. - JL 
• March 17, 2020.  Reorganized links and cleaned up information on front page.  Added new menu item "Classes".  Added categories in the "Resources" menu item.  Added "Detailed C Programming Tutorial" link from SERC Alumni.

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