Revise the header styles so that H2 and H3, and H3 and body text would become easier to distinguish from each other

[gissoo]

No description provided.

[gissoo]

@richmanrachel @mrustow Please look at the two proposed revisions and compare them to the current styles which I have also included here. I have placed the header sizes next to each header. The changes will affect the size of the page title as well, which you see here as well.

Here is the link to the revisions in Figma

[mrustow]

I prefer Proposal 1.

[gissoo]

Thanks @mrustow! I've also adjusted the sizes on mobile based on proposal 1 and updated the typestyle sheet here, on Figma NOTE: This change does not affect the Error page headers.