Replace gunicorn with waitress

Dockerfile

@@ -56,7 +56,5 @@ RUN if [ $STATIC_BUILD = "TRUE" ] ; \
   then SECRET_KEY=dummy_value uv run python manage.py distill-local build --traceback --force ; \
 fi
 
-CMD ["gunicorn", "--preload", "-b", "0.0.0.0:8000", \
-     "pydis_site.wsgi:application", "-w", "2", "--statsd-host", \
-     "graphite.default.svc.cluster.local:8125", "--statsd-prefix", "site", \
-     "--config", "file:gunicorn.conf.py"]
+CMD ["waitress-serve", "--listen", "*:8000", \
+     "--max-request-body-size=52428800", "pydis_site.wsgi:application"]

manage.py

@@ -31,7 +31,7 @@ class SiteManager:
     Manages the preparation and serving of the website for local use.
 
     This class is used solely for setting up the development
-    environment. In production, gunicorn is invoked directly
+    environment. In production, the WSGI server is invoked directly
     and migrations are handled in an init container.
 
     Usage:

pydis_site/README.md

@@ -53,7 +53,7 @@ the website:
   determine _which URLs will lead to which Django views_.
 
 - [`wsgi.py`](./wsgi.py), which serves as an adapter for
-  [`gunicorn`](https://github.com/benoitc/gunicorn),
+  [`waitress`](https://github.com/Pylons/waitress),
   [`uwsgi`](https://github.com/unbit/uwsgi), or other application servers to run
   our application in production. Unless you want to test an interaction between
   our application and those servers, you probably won't need to touch this.

pyproject.toml

@@ -13,7 +13,6 @@ dependencies = [
     "django-prometheus==2.4.1",
     "django-simple-bulma==2.6.0",
     "djangorestframework==3.16.0",
-    "gunicorn==24.1.1",
     "httpx==0.28.1",
     "markdown==3.8.2",
     "psycopg[binary]==3.2.9",
@@ -22,6 +21,7 @@ dependencies = [
     "python-frontmatter==1.1.0",
     "pyyaml==6.0.2",
     "sentry-sdk==2.33.0",
+    "waitress==3.0.2",
     "whitenoise==6.9.0",
 ]
 
@@ -76,7 +76,6 @@ select = ["ANN", "B", "C4", "D", "DJ", "DTZ", "E", "F", "ISC", "INT", "N", "PGH"
 "pydis_site/apps/**/tests/test_*.py" = ["ANN", "D"]
 "static-builds/netlify_build.py" = ["T201"]
 "pydis_site/apps/api/tests/test_off_topic_channel_names.py" = ["RUF001"]
-"gunicorn.conf.py" = ["ANN", "D"]
 "pydis_site/apps/api/models/bot/off_topic_channel_name.py" = ["RUF001"]
 
 [tool.taskipy.tasks]