Sylvia/docs/sfd

@mhoeber @lamagnifica SFD_ORA.rst and SFD_mathformatting.rst are ready for a dev review when you guys have the time. (SFD_certificates is still in the writing phase, so ignore that one for now.) Thanks!
I'm trying to say that the system doesn't take the composite scores that each individual peer assigns and average those scores (i.e., if the score from peer 1 is 8 and the score from peer 2 is 6, that doesn't mean the final score is 7, because the final score depends on the score for each criterion).