Update platform-nginx chart to 7.x.x

[addshore]

https://artifacthub.io/packages/helm/bitnami/nginx/7.1.6

7.0.0

This version also introduces bitnami/common, a  as a dependency. More documentation about this new utility could be found . Please, make sure that you have updated the chart dependencies before executing any upgrade.
Ingress configuration was also adapted to follow the Helm charts best practices.

Note: There is no backwards compatibility due to the above mentioned changes. It's necessary to install a new release of the chart, and migrate your existing application to the new NGINX instances.