docs: add Discord community badge

[robjtede]

Add a live Discord badge to the README so users can ask questions and chat in #nix. The invite never expires and has unlimited uses.

The badge shows the x52dev server’s online member count.

Verified the invite against the saved Discord invite list and checked the README diff.

[coderabbitai]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 95ec568d-d6c4-4ee4-8866-a8a30b7e6d47

📥 Commits

Reviewing files that changed from the base of the PR and between 6339d8a and 8b6890b.

📒 Files selected for processing (1)

• README.md

Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The README adds a Discord badge beneath its title. The badge links to the project’s Discord invite.

Changes

README badge

Layer / File(s)	Summary
Add Discord badge README.md	A Discord badge beneath the README title links to the project invite.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 8b689

The README badge links to the active x52dev Discord server’s nix channel. No actionable merge-blocking issue was identified.

Architecture Summary

Architecture risk: 🔵 Low · up to 8b689

The change affects 1 system.

Changed systems: README.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — README.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in README.md: Added a Discord badge linked to the project’s invite.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README change: adding a Discord community badge.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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