Deleted custom authenticator doc, legacy/unused.
Deleted custom authenticator doc, legacy/unused.

khorne3/docs,hamzawi06/docs,yvonnewilson/docs,khorne3/docs,Annyv2/docs,sandrinodimattia/docs,Annyv2/docs,Annyv2/docs,sandrinodimattia/docs,hamzawi06/docs,jeffreylees/docs,yvonnewilson/docs,auth0/docs,jeffreylees/docs,Catografix/docs,jeffreylees/docs,auth0/docs,hamzawi06/docs,khorne3/docs,auth0/docs,Catografix/docs,Catografix/docs,sandrinodimattia/docs,yvonnewilson/docs