Set up proper FastCGI environment for Discourse and use nginx

modules/discourse/files/intraforum.adblockplus.org

+server {
+  listen       [::]:80;
+  server_name  intraforum.adblockplus.org;
+  location / {
+    rewrite (.*) https://intraforum.adblockplus.org$1 permanent;
+  }
+}
+server {
+  listen       [::]:443 ssl;
+  server_name  intraforum.adblockplus.org;
+  ssl_certificate sites-available/adblockplus.org_sslcert.pem;
+  ssl_certificate_key sites-available/adblockplus.org_sslcert.key;
+
+  gzip on;
+  gzip_min_length 1000;
+  gzip_types application/json text/css application/x-javascript;
+
+  sendfile on;
+  keepalive_timeout 65;
+
+  location / {
+    root /opt/discourse/public;
+
+    location ~ ^/t\/[0-9]+\/[0-9]+\/avatar {
+      expires 1d;
+      add_header Cache-Control public;
+      add_header ETag "";
+    }
+
+    location ~ ^/assets/ {
+      expires 1y;
+      add_header Cache-Control public;
+      add_header ETag "";
+      break;
+    }
+
+    # If the file exists as a static file serve it directly without
+    # running all the other rewite tests on it
+    if (-f $request_filename) {
+      break;
+    }
+
+    include /etc/nginx/fastcgi_params;
+    if (!-f $request_filename) {
+      fastcgi_pass unix:/tmp/discourse-fastcgi.sock;
+      break;
+    }
+  }
+}