Add email when link gymnast to event.

jarvis/planning/views.py

@@ -4,6 +4,7 @@ from django.shortcuts import render, get_object_or_404
 from django.views.decorators.http import require_http_methods
 from django.urls import reverse
 from django.core.mail import send_mail
+from django.conf import settings
 
 import pendulum