Figure out how to select "best ROR" for github people/organizations

[jmelot]

We matched github repo owners from ORCA to ROR using urls, with the results written to orca_org_rors.json. The data needs to be cleaned up further, though - many orgs have multiple RORs. We should figure out how to select the "best" ROR. Ideas:

• [Dominika] Use institutional hierarchy to e.g. choose org highest in the hierarchy
• Use string similarity between github org name and ROR org name (would only work for github organizations, though, not users)