[django] Make the django examples consistently use DJANGO_SECRET_KEY (#1458)

Make DJANGO_SECRET get required to be populated when creating repo (#1457)

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

[django] Document setting up the secret key (#1455)

starlette example (#1454)

go api example (#1453)

Update nextjs flask example (#1452)

Fix fastapi example (#1451)

fix python celery example deploy url (#1450)

celery example (#1449)

Mark framework for the django examples as being Python (#1448)

gin example (#1447)

Drop some broken relatedTemplates links (#1446)

Try publishing templates for the python directory also (#1445)

Tweak django readme language. (#1444)