ported varnish docs

docs/configuring/proxies/varnish.rst

@@ -1,6 +1,10 @@
-To be sure Varnish will work properly with NodeBB check that your configuration ```/etc/varnish/default.vcl``` is optimized for **websockets**.
+Configuring Varnish Cache
+==========================
+
+To be sure Varnish will work properly with NodeBB check that your configuration ``/etc/varnish/default.vcl`` is optimized for **websockets**.
+
+.. code:: 
 
-```varnish
   backend nodebb {
     .host = "127.0.0.1"; # your nodebb host
     .port = "4567"; # your nodebb port
@@ -31,4 +35,3 @@ sub vcl_pipe {
       set bereq.http.upgrade = req.http.upgrade;
     }
   }
-```