Enlarge client_max_body_size for north
For some examples we get the error 413 Request entity too large
which is related to a client_max_body_size which is too small in the nginx reverse proxy (https://github.com/jupyterlab/jupyterlab/issues/4214).
This MR sets the client_max_body_size to 500mb to resolve this issue for deployments.
I'm not sure if the config change for k8s is sufficient the way I made it, since I'm not very experienced with it.
Edited by Florian Dobener