Jk k8 migration static assets

This PR is for ENSWBSITES-2003 - Refactor k8s manifest for ensembl-client ( Static Asset Service)

PR changes

Updated nginx deployment and ingress configs

Cluster changes

Applied the config map and secrets found in static-assets/

ens_adm02@wp-np3-32 ~/k8-mig]$ nkh get cm | grep static-assets-copy-configmap
static-assets-copy-configmap          4      3m10s
[ens_adm02@wp-np3-32 ~/k8-mig]$ nkh get secrets | grep artifact-download-token
artifact-download-token       Opaque                                1      71s