Informing new users to mark as captive/cultivated

[danaleeling]

@mreith

As computer vision is currently not trained on casual observations

@kueda

The vision system is trained on captive / cultivated records. However, our automated suggestions are based on vision results and nearby records, and the nearby records part of it is currently only using RG records, so if vision ranks Canary Island Pine highly, it might get knocked down by the legit lodgepole records in the Transverse Ranges.

That said, onboarding new users with a reminder to mark captive/cultivated for the first few observations sounds reasonable.