📝 README links to doc folder update

[decima]

Purpose

Seems like the folder docs has been renamed to documentation, but readme has not been updated. So here it comes 🫶

External contributions

Thank you for your contribution! 🎉

Please ensure the following items are checked before submitting your pull request:

General requirements

• I have read and followed the contributing guidelines
• I have read and agreed to the Code of Conduct
• I have added corresponding tests for new features or bug fixes (if applicable)

Skip the checkbox below 👇 if you're fixing an issue or adding documentation

• Before submitting a PR for a new feature I made sure to contact the product manager

CI requirements

• I made sure that all existing tests are passing
• I have signed off my commits with git commit --signoff (DCO compliance)
• I have signed my commits with my SSH or GPG key (git commit -S)
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• I have added a changelog entry under ## [Unreleased] section (if noticeable change)

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[coderabbitai]

Walkthrough

Updated six README resource paths from /docs/ to /documentation/, covering banner and collaboration images, the Documentation navigation link, the installation guide, environment variables documentation, and the Europe OpenSource image.

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

🚥 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.
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.
Title check	✅ Passed	The title clearly reflects the README link updates from docs to documentation.
Description check	✅ Passed	The description matches the change by explaining the docs-to-documentation README update.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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