Add social icons to bottom of Outreach email

For school administrators using GiveCampus Outreach. Controls can differ between the classic email editor and the newer Composer editor.

In the supported legacy Outreach composer, insert the Footer content snippet, which contains social-icon placeholders, then link each retained icon to the school’s actual social profile and remove unused ones. Replace placeholder logo/text, add meaningful alternative text and test every link in a received email. A snippet supplies editable design content, not automatic social-account connections; other editor versions may use their own image/link blocks.