Reverse proxy configuration documentation

[zakaria2905]

Adapting REVERSEPROXY.md for traefik ingress feature in helm-fadi:
https://github.com/cetic/helm-fadi/tree/feature/traefik-ingress

[banzo]

• Add ingress to Superset
• document the port forward command pour adminer/phpldapadmin (in userguide and usermanagement at least)

Changes needed to INSTALL.md:

• do not activate the minikube ingress plugin
• remove kubectl config set-context minikube

Update userguide:

• minikube service is not working anymore
• creating the tunnel
• how to update hosts file (linux, mac, windows)

Changes needed to deploy.sh:

• missing helm dep up

[banzo]

Some of the review comments still need to be addressed:

• do we really need to introduce the example.yaml instead of the values.yaml? if really needed, explain how to use it instead of the default values.yaml file.
• we should come up with a url scheme that is more relevant, something like dashboard.traefik.fadi.cetic.be maybe?
• explain why we do not set it as secure, and how it should be configured in production
• make a link to the ingressroutes file (in helm-fadi I guess?)

I am guessing some are also taken care of in #144, please check.

[banzo]

see comment above