Add more Ruff rules (#891)

* ruff: apply rule F

* ruff: apply rule E

* ruff: apply rule SIM

* ruff: apply rule TCH

* ruff: apply rule ERA

* ruff: apply rule PLW

* ruff: apply rule FLY

* ruff: apply rule PERF

* ruff: apply rules FURB & RUF

subscription/urls.py

@@ -15,7 +15,7 @@
 
 from django.urls import path
 
-from subscription.views import *
+from subscription.views import NewSubscription, SubscriptionsStatsView
 
 urlpatterns = [
     # Subscription views