docs(readme): remove special configuration when using Spring

[javier-godoy]

This configuration applies to Vaadin component scanning, which is not required by JsonMigrationHelper

Summary by CodeRabbit

• Documentation
  • Removed Spring configuration section from README, including configuration examples and resources.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

A section documenting special Spring configuration requirements has been removed from the README.md file, along with its associated example and external reference link.

Changes

Cohort / File(s)	Summary
Documentation updates README.md	Removed "Special configuration when using Spring" section, including descriptive text, vaadin.allowed-packages configuration example, and external link reference

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• mlopezFC
• paodb

Pre-merge checks and finishing touches

✅ 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: removing a Spring-related configuration section from the README documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch javier-godoy-patch-1

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3970602 and 793a423.

📒 Files selected for processing (1)

• README.md

💤 Files with no reviewable changes (1)

• README.md

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[mlopezFC]

LGTM