Standardisation of affiliations

[bianchini88]

Description
There is currently no control in the list of contributors over their affiliations.
While at some point an integration with ROR might become desirable,
this could be fixed manually for now e.g. as part of a hackathon of the editorial team.
My suggestion would be to use the main label from ROR for each institution.

Using this label could also be added to the documentation when relevant (both for contributors and editors).

[bedroesb]

We ourselves will not change the actual values of the affiliations, at most the syntax of how to list multiple affiliations.

To do: Add a suggestion to the docuemntation and contributors.yml file to match the affiliation with the entry in ROR