Frond End Assistance And Iterative Clean Up

This relates to XX-4076 and XX-4092. This is largely cleaning up documentation for front end. There was also clean up where I identified a bug in the client registration code-path as well a poorly named method off of reception identity.

This also included exposing IsRegisteredWithUd after front end specifically asked for a method to have UD registration context; they need to know if they have to show the page where the user inputs a username if not registered.

bindings/e2e.go

@@ -145,19 +145,26 @@ func (e *E2e) GetUdCertFromNdf() []byte {
 // Returns
 //  - []byte - A byte marshalled contact.Contact.
 func (e *E2e) GetUdContactFromNdf() ([]byte, error) {
-	udIdData := e.api.GetCmix().GetInstance().GetPartialNdf().Get().UDB.ID
+	// Retrieve data from E2e
+	netDef := e.api.GetCmix().GetInstance().GetPartialNdf().Get()
+	e2eGroup := e.api.GetE2E().GetGroup()
+
+	// Unmarshal UD ID
+	udIdData := netDef.UDB.ID
 	udId, err := id.Unmarshal(udIdData)
 	if err != nil {
 		return nil, err
 	}
 
-	udDhPubKeyData := e.api.GetCmix().GetInstance().GetPartialNdf().Get().UDB.DhPubKey
-	udDhPubKey := e.api.GetE2E().GetGroup().NewInt(1)
+	// Unmarshal DH pub key
+	udDhPubKeyData := netDef.UDB.DhPubKey
+	udDhPubKey := e2eGroup.NewInt(1)
 	err = udDhPubKey.UnmarshalJSON(udDhPubKeyData)
 	if err != nil {
 		return nil, err
 	}
 
+	// Construct contact
 	udContact := contact.Contact{
 		ID:       udId,
 		DhPubKey: udDhPubKey,