Course sidebar min-width

[jasmussen]

The responsive treatment of the sidebar is causing some typographic widows in a few places. E.g. “Practice” And “3 days ago”:

We should probably give the sidebar a fixed 280px width across every breakpoint until it stacks below the content, to avoid this. We might also throw in something like this in a more blanket way:

th, td {
	/* Safari fallbacks */
	white-space: normal;
	text-wrap: balance;
	text-wrap: pretty;
}