Add link(ed) to social account on profile page

It is hard to change link(ed) social account (like github), so adding link(ed) social accounts on profile page on site, so users can easily add/change/delete linked accounts?

Start at the site's profile page and trace how linked social accounts are currently changed. Identify the entry points for adding, changing, and deleting an account, then verify that each action is available from the profile page and works end to end. No specific files or tests are named in the issue.

Written by the indexing model from the issue text.