fix: replace broken Discord badge image in README

[danieljrc888]

Summary

• Replaced the broken Discord badge (dcbadge.vercel.app) with a shields.io badge that renders correctly
• The Discord invite link remains unchanged

Test plan

• Verify the Discord badge renders correctly on the GitHub README page
• Verify the badge links to the correct Discord invite

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated the Discord community badge styling in project documentation for improved visual consistency.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 32e76ee and f853578.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md Discord badge URL was updated from dcbadge.vercel.app to img.shields.io, changing the badge image styling while maintaining the same Discord server link.

Changes

Cohort / File(s)	Summary
Documentation README.md	Discord badge URL replaced with new img.shields.io URL for updated styling.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A badge gleams bright with shields so new,
The Discord link still shines right through,
One line changed, the style is fresh,
Just a polish, nothing else! 🎀

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: replacing a broken Discord badge image in the README, which matches the changeset perfectly.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/discord-badge-image

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