Use black as formatter for python files

Add editorconfig

NetBox should always be referred to as NetBox ...

Fix all instances of "Netbox".

```Shell
git ls-files -z . | xargs --null -I '{}' find './{}' -type f -print0 | xargs --null sed --in-place --regexp-extended 's#Netbox#NetBox#g;'
```

Ref: https://netbox.readthedocs.io/en/stable/development/style-guide/#branding

Is greater than or equal to is "-ge" and not "-gte".

Gunicorn is replaced with nginx-unit ...

We now serve Netbox with an nginx-unit instance instead of Gunicorn.
This allows us to get rid of the extra Nginx container because Unit is
also serving the static files. The static files are now collected at container
buildtime instead of every startup.

Merge pull request #354 from comphilip/release ...

Fix ldap configuration in /etc/netbox/config/ldap/*.py not loaded

use extend method for simplification. ...

Co-authored-by: Christian Mäder <[email protected]>

Fix ldap configuration in /etc/netbox/config/ldap/*.py not loaded

Revert changes to 'gunicorn_config.py'

Adds Prometheus/Grafana monitoring infrastructure

Merge core functionality into `configuration.py` ...

Which is the file `docker/configuration.docker.py` in our repo.
The common code is then imported by `docker/ldap_config.docker.py`.

Revert accidential change to _read_secret order

Consistency in namespace name

Dot character has special meaning in module names ...

Therefore we esacpe it using the underscore character.

Lower gunicorn default loglevel

Dynamically load configuration files

Prefer secret to env variable if both are configured

Remove the 'X-Forwarded-Proto' line from the nginx config ...

The reason is that in the default configuration nginx is only serving 'http' traffic.
So if an upstream proxy sets the 'X-Forwarded-Proto' header, because it is terminating
TLS, then nginx will overwrite it to 'http'. This will cause django to think the page
is served via 'http' and it will not create 'https://...' URLs.

Related to #292

Building the Docker image with Github Actions

Merge pull request #186 from netbox-community/non-root ...

Non root

Massive speedup in executing startup_scripts

set umask in entrypoint

fix typo

Introduce $SKIP_SUPERUSER ...

This adds a new variable to skip the creation of the superuser.
That is useful for LDAP and for production environments.

Fixes #160

Make startup scripts optional ...

To optimize the application boot time the startup scripts can now be
disabled by an ENV variable. The default when the variable is not set,
is to run the startup scripts. This means that the default behaviour is
not changed from earlier releases.

Remove deprecation warning for netboxcommunity images

Consistent variable use in build scripts

♻️ Make netbox-worker it's own container ...

One container should ideally have one responsibility [1]. Therefore I
implemented the netbox-worker to start in it's own container. This is
possible, because netbox and the worker communicate via redis anyway.

They still use the same image underneath, just the "command" they
execute while starting different.

Or in other words: I see no reason to introduce supervisord, when we
already have docker-compose which can take care of running multiple
processes.

Also, here's another benefit: Now it's possible to view the logs of the
webhook worker independently of the other netbox logs (and vice-versa).

Other changes in this commit:
* I don't see a reason to put a password for Redis in the docker-compose
  setup, so I removed it.
* Slightly changed the nginx config, so that the nginx startup command
  becomes simpler and any error should be visible in the docker log.
* Some housekeeping in the `Dockerfile`.
* Added some troubleshooting advice regarding webhooks to the README.

I'd like to thank Brady (@bdlamprecht [2]) here who did the harder
work of figuring out what's even required to have webhooks working. [3]

[1] 
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#decouple-applications
[2] https://github.com/bdlamprecht
[3] https://github.com/ninech/netbox-docker/pull/90

Update docker-entrypoint.sh ...

Make netbox-docker function with  v2.4-beta1 again, fixes #84.

> The shell --plain option is deprecated in favor of -i python or --interface python.
> The shell --interface option now accepts python to force use of the “plain” Python interpreter.
https://docs.djangoproject.com/en/2.0/releases/1.10/#deprecated-features-1-10

Fixed missing "