Creates the html UI of the "Sign in with *" buttons. These buttons are only
necessary if you enable social sign in via the sign_in_providers argument
passed to global_sessions_config.
providers_ui(ns, sign_in_providers = c("google", "email"))the 'shiny' namespace function created with shiny::NS().
the sign in providers to enable. Valid values are "google"
"email", "microsoft", and/or "facebook". Defaults to c("google", "email").
the html UI of the "Sign in with *" buttons.