Created by: ffoodd
Followups content should probably be in a landmark to improve discoverability for ATs; thus I wrapped them in main, and also used sections too since that's basically what this element is for.
This one is not critical at all, opinions are welcome.
BTW: our current template for docs also have its intro content (h1 and lead) outside any landmark—thus not discoverable by users navigating with landmarks. It'd require to revamp the whole grid layout to change this: should I suggest a fix?