Add getting started documentation for users who want to quickly use cert-manager to issue LetsEncrypt certificates

[wallrj]

I feel like the letsencrypt tutorials should be front and centre on the cert-manager.io page and if they need rewriting, we should try and make it really simple for newbies to get cert-manager installed and issuing LetsEncrypt certificates.

A friend of mine wrote:

it looks like a lot of steps and I don’t really understand the purpose of any of them, I just want someone to sign my CSR!

xref

• Create a sequence diagram that shows how a certificate gets issued with let's encrypt #426
• Remove old TODO message #541
• Rework of the landing page (cert-manager.io) #532

[wallrj]

@inteon just found this quick start tutorial (install CM -> configure Let's Encrypt -> Issue an Ingress certificate) https://www.getambassador.io/docs/edge-stack/latest/howtos/cert-manager/ which is a nice example.

[inteon]

Below are some of the links that I've found by doing a quick google search:

AS PART OF A DEPLOYMENT:

https://www.getambassador.io/docs/edge-stack/latest/howtos/cert-manager/
https://rancher.com/docs/rancher/v2.x/en/installation/resources/upgrading-cert-manager/
https://istio.tetratelabs.io/istio-ca-certs-integrations/cert-manager-integration/
https://knative.dev/docs/serving/installing-cert-manager/
https://linkerd.io/2.10/tasks/automatically-rotating-control-plane-tls-credentials/
https://docs.garden.io/advanced/cert-manager-integration

CLOUD PROVIDERS:

https://docs.microsoft.com/en-us/azure/aks/ingress-tls#install-cert-manager
https://www.ibm.com/docs/en/app-connect/11.0.0?topic=kubernetes-installing-cert-manager-in-your-cluster
https://www.redhat.com/sysadmin/cert-manager-operator-openshift
https://www.digitalocean.com/community/tutorials/how-to-set-up-an-nginx-ingress-with-cert-manager-on-digitalocean-kubernetes

HOWTO GUIDES:

https://www.howtoforge.com/what-is-cert-manager-and-how-to-setup-cert-manager-for-ssl-certificates-in-kubernetes-cluster-on-aws-using-helm/
http://blog.zachinachshon.com/cert-manager/
https://www.fairwinds.com/blog/upgrade-cert-manager-its-worth-it
https://cert-manager-munnerz.readthedocs.io/en/stable/getting-started/2-installing.html
https://headworq.eu/en/installing-and-using-cert-manager-in-kubernetes/
https://medium.com/@CarlosJuanGP/help-with-certmanager-on-k8s-444db0e1e877
https://smallstep.com/docs/tutorials/kubernetes-acme-ca
https://medium.com/google-cloud/https-with-cert-manager-on-gke-49a70985d99b