replace mailjet with sendgrid

webapp/tests/test_signup.py

@@ -83,7 +83,7 @@ class SignupTestCase(APITestCase):
     def test_delete_signup_token(self):
         pass
 
-    # TODO: Use some mocking library and check that mailjet is actually called
+    # TODO: Use some mocking library and check that sendgrid is actually called
     def test_signupee_sendemail(self):
         form = self.signupForm
         emailURL = f"/api/signupForm/{form.id}/sendemail/"