Replace nginx with haproxy

[bryanbellsmith]

Purpose

The ingress controller ingress-nginx will soon be deprecated. The intent of this change is to replace this chart with haproxy-ingress. Additionally, the external secrets operator instructions for Azure have been added.

What's changed

• Removed chart dependencies - instructions added to manually install these instead (which simplifies some chart interactions)
• Switched README.md instructions for ingress-nginx with haproxy-ingress
• Updated README.md with External Secrets Operator instructions for AKS
• Renamed images in README.md to correspond with AWS ESO instructions
• Added images for Azure ESO instructions
• Updated NOTES.txt to include pod instructions regardless of ingress setup
• Reworked cert-manager templates for self-signed certificates
• Minor bugfixes for External Secrets Operator templates
• Switched examples in values.yaml to be YAML formatted, rather than mixing JSON
• Added a lot more comments in values.yaml to describe the options
• Removed cert-manager and ingress-nginx sections from values.yaml, they are now configured outside of the Private AI chart
• Minor updates to missing parameters in values.yaml

Testing

• Tested locally with helm lint
• Tested by Github CI
• Tested in an AKS cluster
• Tested in an AWS cluster

Checklist

• Update chart version if planning a release
• Update README.md

[a-guiducci]

Looks good! 🚀