replace "recently signed up" with "recent givers" and "recent receivers"

[chadwhitacre]

Reticketed from #634, per @bbinkovitz and @MikeFair.

[T]he "Most recently signed up" display [...] often showcases profiles that haven't been filled out yet. It might make the front page more meaningful if instead of/in additon to "most recent signups" there were "most recently completed profile" and/or "most recent givers/receivers"?

[dowski]

+1

Or possibly badge new accounts with the amount they are giving and/or receiving.

In any event, I might be weird, but when I visit the homepage, I often click each new participant to see if they are giving/receiving. :-)

[dowski]

Also, does this ticket outmode #347?

[chadwhitacre]

This seems to have stalled.