replace slippers with django-cotton

main reason: slippers cannot pass request via context inside its
components, making it annoying to use template takes that take request.
more reasons: not actively worked on, no named slots, having to define
components in components.yaml + new components do not get registered
without restarting server

timetracker/settings.py

@@ -41,7 +41,7 @@ INSTALLED_APPS = [
     "template_partials",
     "graphene_django",
     "django_htmx",
-    "slippers",
+    "django_cotton",
 ]
 
 GRAPHENE = {"SCHEMA": "games.schema.schema"}
@@ -87,7 +87,6 @@ TEMPLATES = [
             ],
             "builtins": [
                 "template_partials.templatetags.partials",
-                "slippers.templatetags.slippers",
             ],
         },
     },