Webhooks for repo creation/deletion (#1663)

* Webhooks for repo creation/deletion

* add createHookTask

* Add handles for GetSlackPayload and GetDiscordPayload

modules/auth/repo_form.go

@@ -124,6 +124,7 @@ type WebhookForm struct {
 	Create      bool
 	Push        bool
 	PullRequest bool
+	Repository  bool
 	Active      bool
 }