Need help fixing a Django 404 error, not finding a static page using URLConf

My Django project is a single-application website where the homepage shows articles/posts from my database, and will have pages for tag topics and year/month archives. All other pages are static pages for photo and video galleries, and an about page — they don't use the database at all.

I'm trying to get one of the static pages to display, but I keep running into a 404 error with the following (note: I replaced the application's name with "<app_name>"):

No article found matching the query
Request Method: GET
Request URL:    http://127.0.0.1:8000/illustrations
Raised by:  <app_name>.views.ArticleDetailView
Using the URLconf defined in website.urls, Django tried these URL patterns, in this order:
admin
[name='home']
<slug:slug> [name='article_detail']
The current path, illustrations, matched the last one.

The homepage shows all articles in ListView, and you can click individual articles to view them in DetailView with the designated slug as the URL. The "illustrations" file is a separate static HTML page I'll use that has nothing to do with the database or either of the List or Detail views.

I can't tell if I should make the homepage a separate app, or if I just need to change my URLs/Views files. (I'm learning Django and Python, so I'm definitely learning as I go along here.)

Here's views.py:

from django.shortcuts import render
from django.views import generic
from .models import Article
from django.http import JsonResponse # Ignore for now, I just put this here for when I work on making a JSON feed


class ArticleListView(generic.ListView):
    model = Article
    paginate_by = 6
    template_name = "index.html"

class ArticleDetailView(generic.DetailView):
    model = Article
    template_name = "article.html"
    
def illustrations(request):
    return render(request, "illustrations.html")

urls.py (project):

from django.contrib import admin
from django.conf import settings
from django.urls import path, include
from django.conf.urls.static import static

urlpatterns = [
    path('admin', admin.site.urls),
    path("", include("<app_name>.urls")),
] 

if settings.DEBUG:  # new
    urlpatterns + static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)

urls.py (app):

from django.urls import path
from . import views
from django.conf.urls.static import static # Not sure if needed
from django.views.generic import TemplateView
from .views import ArticleListView, ArticleDetailView

# For setup info, see https://learndjango.com/tutorials/django-file-and-image-uploads-tutorial
urlpatterns = [
    path("", ArticleListView.as_view(), name="home"), # This is index.html,
    path("<slug:slug>", ArticleDetailView.as_view(), name="article_detail"),
    path("illustrations", views.illustrations, name="illustrations"),
]

# <app>.urls.py
    
urlpatterns = [
        path("", ArticleListView.as_view(), name="home"), # This is index.html,
        path("illustrations", views.illustrations, name="illustrations"),
        path("<slug:slug>", ArticleDetailView.as_view(), name="article_detail"),
    ]

# <app>.urls.py
    
urlpatterns = [
    path("", ArticleListView.as_view(), name="home"), # This is index.html,
    path("articles/<slug:slug>", ArticleDetailView.as_view(), name="article_detail"),
    path("illustrations", views.illustrations, name="illustrations"),
    ]