Update io.cozy.identities.md

[nicolasrenardcozy]

Readme updated with new scrapped data from connectors

[Crash--]

I'm not in favor of changing those keys. contact entry here, is the same as our io.cozy.contacts doctype. And in this doctype, we use the singular https://github.com/cozy/cozy-doctypes/blob/master/docs/io.cozy.contacts.md

Can we revert those changes? 🙏 .

[Crash--]

Not sure that the filename is useful since it can be renamed for instance. Can't we use a relationship here?

"tax_informations": [
    {
      "year": "2022",
      "RFR": "56789.10",
      "1AJ": "12345.67",
      "1BJ": "23456.78",
      "currency": "EUR",
      "relationship": {
           "type": "io.cozy.files", 
           "_id": XXX
       }