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 but I can't verify that because I don't have any http installation.

I hope this makes sense.
This was my first fork.

Greeting, Chris