v3.1.0: New Use Case, Refactor Styles, Fix Stray Icon

What's Changed

• fix: better title for "Subsequent Publishing" by @mesteva in #249
• Adding a new use case by @nbonfante in #252
• Adding a new use case - fix syntax issues by @wesleyboar in #255
• fix: images linking outside of guide have ↗ by @wesleyboar in #256
• refactor: styles by @wesleyboar in #258

Full Changelog: v3.0.1...v3.1.0