Support linking taxa to accounts

[Adam Winer]

eBird/Clements taxonomy should link to https://ebird.org/species/[speciesId]. iNaturalist-based taxonomies should link to https://www.inaturalist.org/taxa/[taxonId]. Requires storing a bonus field per taxon, which means I should get it in soon.

[Adam Winer]

Implemented, and will show it off in the butterfly taxonomy.