Arvados

Desperately want to be able to Collapse the Left Hand Bar which I use seldomly and want my screen real estate back.

From discussion: the UI convention is to put a 3 horizontal line ("hamburger") menu in the upper left to toggle the left nav panel. This will push the title over to the right a little bit but there should be plenty of space.

Related UI change: because the +NEW button is located on the left nav, having the left nav collapsed will cause it to be hidden. We probably want the +NEW button to be moved into the project panel.

It does not have to be added to any other panels -- when those are active, the button was already disabled, because it can only be used when you have a writable project selected. You probably don't have to deal with permissions, either, because the existing component enable/disable logic should already do that.