Expand grid in section info

[firejake308]

I was looking at this layout here, taken from MATH 140 - Spring 2021, when I realized that sections 500 and 501 weren't aligned with each other. This bothered me, but not enough to fix in #568, so I'm making a separate issue to remind myself to fix it later. The solution,if I'm not mistaken, is to move the root grid element up one level so that both sections are within the same grid container