Tune default nginx-unit configuration

Should now handle pretty URLs by default, and use the same max body size
as other server types

nextcloud-unit.json

@@ -122,13 +122,16 @@
                     "root": "/var/www/html/ocs-provider/",
                     "script": "index.php"
                 }
+            },
+            "environment": {
+                "front_controller_active": "true"
             }
         }
     },
 
     "settings": {
         "http": {
-            "max_body_size": 2147483648
+            "max_body_size": 1073741824
         }
     }
 }