v0.55.5

Refines

• Spreads s-prose headers out from paragraphs for better grouping.
• Tightens up s-prose paragraphs a bit, and made sure spacing under headings are consistent.
• Replaces all s-prose margins internal to the component with a CSS variable so our users can more easily monkey with it in their browsers and userscripts.
• Kills trailing margins in s-prose