Theme page sidebar and body heading font and margin changes

[jasmussen]

The subheadings on theme pages, both in the body content and the sidebar, could be refined. Here's how a plugin sidebar looks:

The margin above the headings (Ratings, Support, Donate) is taller than the margin below, the font size is balanced, and the font is a sans-serif system font.

The theme directory could be the same:

• 20px font size
• 50px top margin
• 20px bottom margin

The heading style for H2s in plugins is also good:

• 24px font size
• Same margin as in sidebar

That could replace the EB Garamond subheadings:

[ndiego]

Good catch ➕

[ryelle]

I've updated the default h2 font size, font family, and font weight to match plugins, and gave headings a default top-margin of var(--wp--preset--spacing--40) (50px on large screens).

The headings in the sidebar now use large font size, and otherwise inherit the above changes.

Let me know if I missed anything from the description here.