Provisionally resolve #AG78 - Fix favicon errors
Provisionally resolve #AG78 - Fix favicon errors

This adds an empty icon, using the information at:
  https://stackoverflow.com/questions/1321878/how-to-prevent-favicon-ico-requests/13416784#13416784
csf-dev/agiil,csf-dev/agiil,csf-dev/agiil,csf-dev/agiil