Use nginx as reverse proxy in production

[bjubes]

Uses nginx with static file caching instead of traefik

to test, .envs/.production/.secrets should resemble:

# PostgreSQL
# ------------------------------------------------------------------------------
POSTGRES_HOST=postgres
POSTGRES_PORT=5432
POSTGRES_DB=osler
POSTGRES_USER=BnnIJhssshZrnURWgfjnnEXZRMzhNZCx
POSTGRES_PASSWORD=JzQ6eHA47iiEzURQo1xJ2VPeGpRY81edS1UpuQc82KP5bb7T8t6qR7ANFTRK5bxI


# Django
# ------------------------------------------------------------------------------
DJANGO_SECRET_KEY=PbQjPuCXmpX4dHJITSI2nSJy6lzivrHkyxIZJkAnowUsEzsWkucovzd75yz8BqVH

[justinrporter]

Awesome work!

[bjubes]

i think it makes sense to leave this PR as is until #51 is merged, then ill incorporate those changes into this one

[justinrporter]

sgtm!

[bjubes]

@justinrporter I combined the changes from #58 into here, as well as combined the documentation. Let me know what you think. Also, I don't see the docs page from http://localhost:7000/ or http://localhost:7000/getting-started/ does the list not autogenerate?

Also: I modified /.envs/.production/.umkc to to keep DJANGO_ALLOWED_HOSTS=osler.umkc.edu, please check this is correct as it isn't present in #58