[Draft] Move configuration docs

[colinepiloquet]

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• [ ] Docs have been added / updated (for bug fixes / features)

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[colinepiloquet]

I don't know if it should be in powsybl-core? It is moved from the institutional website. A lot of configuration is linked to iTools, I don't think it should be with general configuration.

[sonarcloud[bot]]

Quality Gate passed

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