Use a more conventional location for sites

it's more common (at meast IME) to use /var/www/example.com rather than
creating a new root folder `sites` to put apps in.

sites-available/ssl.example.com

@@ -35,7 +35,7 @@ server {
   include h5bp/directive-only/ssl.conf;
 
   # Path for static files
-  root /sites/example.com/public;
+  root /var/www/example.com/public;
 
   #Specify a charset
   charset utf-8;