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!
Yep, it renders numbers as well - they appear in plain text in the response field, and they appear rendered as "beautiful math" below the field.