add send_safari_extension_newsletter() to shell

shell.py

@@ -3,10 +3,9 @@ from IPython import embed
 from sqlalchemy_utils import create_database, database_exists, drop_database
 
 from app.config import DB_URI
-from app.email_utils import _render
+from app.email_utils import send_email, render
 from app.models import *
 from server import create_app
-from app import email_utils
 
 
 def create_db():
@@ -31,6 +30,16 @@ def reset_db():
     create_db()
 
 
+def send_safari_extension_newsletter():
+    for user in User.query.all():
+        send_email(
+            user.email,
+            "Quickly create alias with our Safari extension",
+            render("com/safari-extension.txt", user=user),
+            render("com/safari-extension.html", user=user),
+        )
+
+
 app = create_app()
 
 with app.app_context():