[staging] link change on /scientists

[AndrewSallans]

In OSF section, remove the link to the 3-minute video on the OSF (it's from 2012). Replace with link to OSF Getting Started: https://osf.io/getting-started/

Currently reads: "Want more info? Visit the OSF feature page, watch the 3-minute overview, review the introductory material, or sign up and get started. You can also talk to a human."

Tweaks: "Want more info? Visit the OSF feature page, watch the getting started videos, or sign up and begin using the OSF. You can also talk to a human."