Enable websocket nginx support (#36)

Co-authored-by: collabspace <admin@collabspace-app.com>

proxy/includes/proxy.conf

 access_log off;
 proxy_intercept_errors on;
+proxy_set_header Upgrade $http_upgrade;
+proxy_set_header Connection "Upgrade";
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header Host $host;
-proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
\ No newline at end of file
+proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;