docs: add apache config (#108) (#121)

docs/apache_setup.md

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+
+# Apache as reverse proxy
+
+Once spacedeck is running you can use Apache as a reverse proxy. For a general overview of how this works or how to configure specifics the [Apache Reverse Proxy Guide](https://httpd.apache.org/docs/2.4/howto/reverse_proxy.html) provides a good reference.
+
+If you have the required modules and ssl certificates installed skip to the site config.
+
+# Required modules
+
+Install `mod_rewrite`, `mod_proxy` and `mod_proxy_wstunnel`…
+
+```
+sudo a2enmod proxy rewrite proxy_wstunnel
+```
+
+# SSL certificates
+
+Set up `certbot` frmo [letsencrypt](https://letsencrypt.org/) (if required) and get some certs…
+
+```
+sudo certbot --apache certonly -n -d space.example.net
+```
+
+# Site config
+
+This config should work with Apache 2.4 and assumes spacedeck is running on localhost using port 9666, that `mod_rewrite`, `mod_proxy` and `mod_proxy_wstunnel` are active, and that ssl certificates have been installed with `certbot`.
+
+
+```
+<VirtualHost *:443>
+  ServerName space.example.net
+  ServerAdmin webmaster@space.example.net
+
+  ErrorLog /var/log/apache2/spacedeck-error.log
+  CustomLog /var/log/apache2/spacedeck-access.log combined
+
+  # ssl options
+  Include /etc/letsencrypt/options-ssl-apache.conf
+  SSLCertificateFile /etc/letsencrypt/live/space.example.net/fullchain.pem
+  SSLCertificateKeyFile /etc/letsencrypt/live/space.example.net/privkey.pem
+
+  # proxy spacedeck
+  RewriteEngine On
+  RewriteCond %{HTTP:Upgrade} =websocket [NC]
+  RewriteRule /(.*)           ws://localhost:9666/$1 [P,L]
+  RewriteCond %{HTTP:Upgrade} !=websocket [NC]
+  RewriteRule /(.*)           http://localhost:9666/$1 [P,L]
+
+  ProxyPassReverse / http://localhost:9666/
+</VirtualHost>
+```