Add Emailens to Testing resources

[Ouranos27]

Adds a short note to the Testing section of content/docs/resources.md pointing to Emailens, a linter that checks compiled HTML for CSS compatibility across 15 email clients and suggests fixes, from the CLI or in CI. It complements the render-testing services already listed (you lint before you screenshot).

Emailens has first-class Maizzle support with framework-native fix suggestions. The engine, CLI and MCP server are open source (MIT): https://github.com/emailens/engine

Happy to adjust wording or placement if you prefer.

Summary by CodeRabbit

• Documentation
  • Added guidance to lint compiled HTML before submitting it to render-testing services.
  • Added a reference to Emailens for checking CSS compatibility across email clients via CLI or CI.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7018a0f0-98c7-473a-abdd-8390e0849d52

📥 Commits

Reviewing files that changed from the base of the PR and between a8399c9 and 474e38a.

📒 Files selected for processing (1)

• content/docs/resources.md

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📝 Walkthrough

Walkthrough

The Testing resources page now recommends linting compiled HTML before render testing and references Emailens for CSS compatibility checks across email clients through CLI or CI.

Changes

Testing resources documentation

Layer / File(s)	Summary
Compiled HTML linting guidance content/docs/resources.md	Adds guidance to lint compiled HTML before render testing and references Emailens for CSS compatibility checks across email clients via CLI or CI.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change: it adds Emailens to the Testing resources page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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