Unify styles for journal sections on homepage vs archive

[librariam]

Since the heading levels were adjusted for accessibility in 3.2 (#5178), journal sections look visually different on homepage vs in the archive:

I suggest styles be adjusted for a consistent look.

[amy-lyson]

I agree with librariam! The style is way too light and small.

[saalam]

It will be very nice to make the style of the sections in the homepage looks like the style in the archive