Add line "client_max_body_size 0;" to Nginx conf

To avoid the error message from Nginx "Request Entity Too Large" from Webdav clients, the line "client_max_body_size 0;" could be added to the nginx conf for https as a standard.

It should also be added to the http part, if it's applicable but I haven't tried the version without ssl. Can someone verify that?

I hope this makes sense.
This was my first fork.

Greeting, Chris