[django] Tweak names and slugs of the django examples (#1456)

Author: msullivan

python/django-notes/README.md

@@ -1,5 +1,5 @@
 ---
-name: Django Notes
+name: Django Notes App
 slug: django-notes
 description: A simple note-taking app built with Django, using SQLite locally and Postgres on Vercel.
 framework: Python

python/django/README.md

@@ -1,6 +1,6 @@
 ---
-name: Django + Vercel
-slug: django
+name: Django Hello World
+slug: django-hello-world
 description: Use Django on Vercel with Serverless Functions using the Python Runtime.
 framework: Python
 useCase: Starter