Add NASSR to the list of associations to nav bar

[jamiefolsom]

Next to NAVSA | BAVS | AVSA | NASSR

Link to: https://www.nassr.ca/

Also: the nav bar should resize gracefully when the viewport width doesn't allow the brand and those links all to show.

• Keep the nav on a single line
• Add a hamburger menu for links if necessary
• Brand can be hidden if need be
• Be sure that navigation links below the nav are not concealed on narrow browser viewports (as is currently the case).

[camdendotlol]

Done in https://github.com/performant-software/Annotation-Studio/pull/400