Move <dl> elements out of <p> elements

[wetneb]

Quoting @osma from #149 (comment):

HTML nitpick: Isn't <dl> a block element in HTML? It shouldn't be placed inside <p> like this, right?

Creating a specific issue for it since we seem to have consistently included <dl> elements in <p> elements throughout the specs.

[osma]

Maybe using an HTML validator would help? I seem to remember seeing other problematic HTML structures as well, mixing up different kinds of list elements (<dd>...</li> or something along those lines)

[wetneb]

Yes, we could potentially add an HTML validator to the CI.