Add default resource limits to kubernetes for django and nextjs

[nvernooy]

AC:

• Prevent the node running out of resources by adding default limits to deployments (default values that should be reviewed per project)

Set the following default resource limits for Django:

          resources:
            requests:
              cpu: "200m"
              memory: "300Mi"
            limits:
              cpu: "250m"
              memory: "400Mi"

And for NextJS:

          resources:
            requests:
              cpu: "100m"
              memory: "200Mi"
            limits:
              cpu: "250m"
              memory: "300Mi"

Add a note to the docs to indicate that resource limits should be carefully set by observing real workloads in a staging or production environment.