Ingress spec should allow large file uploads

[tdudgeon]

The ingress that is created uses mostly default params.
This means the ability to upload files through jupyter is very limited.
The ingress spec should be updated with soemthing like this:

nginx.ingress.kubernetes.io/proxy-body-size=500m

The value should be a parameter that can be specified at deployment time.
That 500m value is the same that we have in place for the Data manager ingress.

[alanbchristie]

To expose new parameters we need to change the CRD, this is easy but probably easier for an exisiting system if we can first un-deploy the operator, and then redeploy it. I'll make the change and co-ordinate with you on removal of the existing jupyters before deploying the new operator.