docs: Center align README badges

[kieran-ryan]

🤔 What's changed?

• Center align README badges
• Change version badge color from blue to green
• Fix GitHub workflow badge
• Extended summary description and linked logo

Before

After

⚡️ What's your motivation?

• Consistency across Cucumber implementations - aligning with the JavaScript implementation
• Visual consistency

🏷️ What kind of change is this?

• 📖 Documentation (improvements without changing code)

♻️ Anything particular you want feedback on?

• "Automated tests in plain language, for JVM" tagline suitability
• External permalink logo suitability - or whether to include a copy of the SVG in the repository alternatively
• Whether the summary description is suitable or requires updates

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.

[mpkorstanje]

LGTM. Feel free to merge after addressing the nitpicks.

[kieran-ryan]

Appreciate the review @mpkorstanje - changes applied with both comments - thanks for flagging! I would be less push rights for main with this repo - being without need - so unable to merge my side, if suitable to apply merge