docs: remove testing guides section

[jdegand]

Summary by CodeRabbit

• Documentation
  • Updated the Testing section in the README with reorganized resources. Moved a testing guide to the Books section and removed several outdated guide references to streamline documentation.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation reorganization in README.md: moved a testing guide entry from Guides to Books section and removed four related guide entries from the Testing subsection.

Changes

Cohort / File(s)	Summary
Documentation Links Reorganization README.md	Relocated "Testing Angular – A Guide to Robust Angular Applications" from Guides to Books section; removed four guide entries: "angular-tour-of-heroes-jest-100-coverage", "how-do-i-test", "Tim Deschryver Blog", and duplicate testing guide reference.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• docs: remove links from trainings, blogs, and more #1786 — Prunes and reorganizes documentation links in README.md similarly to consolidate guide entries.
• docs: remove templates and more #1520 — Directly modifies the Testing → Guides subsection and removes the same guide entries as this PR.

Poem

📚✨ A guide found its new home,
From Guides to Books it did roam,
Some entries we've shed,
Testing knowledge well-spread,
Now the library's cleaner—hop, hop, gnome! 🐰

🚥 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 pull request title accurately describes the main change: removing the testing guides section from the README.md file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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