Add structure to Setup/ docs

docs/source/Setup/HAProxy-Config.md

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+# HAProxy Config (Optional)
+
+### Evennia, HTTPS and Secure Websockets can play nicely together, quickly.
+
+This sets up HAProxy 1.5+ in front of Evennia to provide security.
+
+Installing HAProxy is usually as simple as:
+```
+# Redhat derivatives
+yum install haproxy
+# dnf instead of yum for very recent Fedora distros.
+```
+or
+```
+# Debian derivatives
+apt install haproxy
+```
+
+Configuration of HAProxy requires a single file given as an argument on the command line:
+```
+haproxy -f /path/to/config.file
+```
+
+In it (example using haproxy 1.5.18 on Centos7):
+```
+# stuff provided by the default haproxy installs
+global
+    log /dev/log local0
+    chroot /var/lib/haproxy
+    maxconn  4000
+    user  haproxy
+defaults
+    mode http
+    option forwardfor
+
+# Evennia Specifics
+listen evennia-https-website
+    bind <public-ip-address>:<public-SSL-port--probably-443> ssl no-sslv3 no-tlsv10 crt
+/path/to/your-cert.pem
+    server localhost 127.0.0.1:<evennia-web-port-probably-4001>
+
+listen evennia-secure-websocket
+    bind <public-ip-address>:<WEBSOCKET_CLIENT_URL 4002> ssl no-sslv3 no-tlsv10 crt /path/to/your-
+cert.pem
+    server localhost 127.0.0.1:<WEBSOCKET_CLIENT_URL 4002>
+    timeout client 10m
+    timeout server 10m
+```
+
+Then edit mygame/server/conf/settings.py and add:
+```
+WEBSERVER_INTERFACES = ['127.0.0.1']
+WEBSOCKET_CLIENT_INTERFACE = '127.0.0.1'
+```
+or
+```
+LOCKDOWN_MODE=True
+```
+and
+```
+WEBSOCKET_CLIENT_URL="wss://yourhost.com:4002/"
+```