docs: add npmx badge builder to readme related projects section

[yuyinws]

🔗 Linked issue

🧭 Context

npmx has a great custom badge feature. I build a playground npmx-badge to help user create custom badges quickly.

This PR add it to docs.

📚 Description

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Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ready	Preview, Comment	Mar 17, 2026 0:51am
npmx.dev	Ready	Preview, Comment	Mar 17, 2026 0:51am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Mar 17, 2026 0:51am

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c456a3f9-8b89-4303-a909-0d6830a46371

📥 Commits

Reviewing files that changed from the base of the PR and between fbb9011 and b0010d0.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

This change adds a new npmx-badge entry to the README's features and external project links section. The modification expands the list of badge playground items available for reference. The update affects only documentation with no alterations to exported entities, logic, or control flow mechanisms.

Suggested reviewers

• danielroe

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The PR description clearly relates to the changeset, explaining the addition of npmx-badge to documentation with context about the feature.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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