simple function to let user "opt in" to linking id's

[magpiedin]

• if they have funders, "want to link to FundRef id's?"
• if taxa are included in coverage, "want to auto-build higher taxa?"

("opting in" might be a funny way to put it if it's more of a "point users to a place where they can find their own id's for their own funders/taxa/etc if those are present in their dataset.")