Правка urls.py

from django.conf.urls.static import static
from django.urls import path
 
from love import settings
from pages.views import *
 
urlpatterns = [
    path('', Home.as_view(), name='main'),
    path('story/<slug:post_slug>/', post_detail, name='post_detail'),
    path('pdf/<pk>/', render_pdf_new, name='render_pdf_new'),
    path('category/<slug:cat_slug>/', Category.as_view(), name='category'),
    path('bio/', bio, name='bio'),
    path('add/', add, name='add'),
    path('contact/', contact, name='contact'),
    path('success/', success, name='success'),
]
 
if settings.DEBUG:
    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

from django import template
from pages.models import *
 
register = template.Library()
 
menu = [{'title': "Главная", 'url_name': '/'},
        {'title': "Произведения", 'url_name': 'stories'},
        {'title': "Биография", 'url_name': 'bio'},
        {'title': "Доп. материалы", 'url_name': 'add'}]
 
@register.inclusion_tag("pages/list_menu.html")
def show_menu():
    return {'menu': menu}
 
@register.inclusion_tag("pages/list_categories.html")
def show_categories():
    cats = Category.objects.all()
    return {'cats': cats}

<ul class="list-group list-group-horizontal list-unstyled justify-content-end my-3">
    {% for m in menu %}
    <li class="px-3"><a class='text-decoration-none smallest h4' href="{{ m.url_name }}">{{ m.title }}</a></li>
    {% endfor %}
</ul>