Added banner-plasmonic.jpg to front page
Fixed research themes label
Added links to research images and photos on homepage
Remove blue background from menu in tablet and smaller mode
Added bootstrap blue variable.  Removed blue outlines.  Made menu background turn bootstrap blue on click.
Added links to carousel and changed mobile images
Changed text a bit
Added Nick's page.  Midway through working on grad students page.
Added info to footer and adjusted footer margin on research pages