calamari 1.4 branch: modify httpd to be reverse proxy instead of WSGI host

Since 1.4, the REST API WSGI application is hosted by calamari-lite at localhost:8002. Should httpd should be configured as a reverse proxy instead of wsgi host?

I think USE_X_FORWARDED_HOST = True may be necessary in calamari_web settings.py for rewriting of absolute URLs.

Something like (for all static assets):

```
Alias /static /opt/calamari/webapp/content/

ProxyPass "!"
= 2.4>
Require all granted

SetHandler None

### repeat for all static assets
### proxy to calamari-lite's gevent pywsgi application
### Option to disable SSL?

= 2.4>
Require all granted

ProxyPass "https://localhost:8002/"
ProxyPassReverse "https://localhost:8002/"
SetHandler None

```

For Django: calamari_web/settings.py

```
USE_X_FORWARDED_HOST = True
```

If this is correct, I will submit a PR.

Locate the httpd configuration for the calamari 1.4 branch and read calamari_web/settings.py, focusing on the proposed reverse-proxy and forwarded-host behavior. Verify that static assets remain directly served, the REST API is proxied to calamari-lite on localhost:8002, and absolute URLs are rewritten correctly; resolve the SSL option before considering the work done.

Written by the indexing model from the issue text.