Update README.md

* Add SCEP support
* Fix ACME tutorial URLs

README.md

@@ -66,7 +66,8 @@ You can issue certificates in exchange for:
 - [Cloud instance identity documents](https://smallstep.com/blog/embarrassingly-easy-certificates-on-aws-azure-gcp/), for VMs on AWS, GCP, and Azure
 - [Single-use, short-lived JWK tokens](https://smallstep.com/docs/step-ca/provisioners#jwk) issued by your CD tool — Puppet, Chef, Ansible, Terraform, etc.
 - A trusted X.509 certificate (X5C provisioner)
-- Expiring SSH host certificates needing rotation (the SSHPOP provisioner)
+- A SCEP challenge (SCEP provisioner)
+- An SSH host certificates needing renewal (the SSHPOP provisioner)
 - Learn more in our [provisioner documentation](https://smallstep.com/docs/step-ca/provisioners)
 
 ### 🏔 Your own private ACME server
@@ -80,16 +81,17 @@ ACME is the protocol used by Let's Encrypt to automate the issuance of HTTPS cer
   - For `tls-alpn-01`, respond to the challenge at the TLS layer ([as Caddy does](https://caddy.community/t/caddy-supports-the-acme-tls-alpn-challenge/4860)) to prove that you control the web server
 
 - Works with any ACME client. We've written examples for:
-  - [certbot](https://smallstep.com/blog/private-acme-server/#certbotuploadsacme-certbotpng-certbot-example)
-  - [acme.sh](https://smallstep.com/blog/private-acme-server/#acmeshuploadsacme-acme-shpng-acmesh-example)
-  - [Caddy](https://smallstep.com/blog/private-acme-server/#caddyuploadsacme-caddypng-caddy-example)
-  - [Traefik](https://smallstep.com/blog/private-acme-server/#traefikuploadsacme-traefikpng-traefik-example)
-  - [Apache](https://smallstep.com/blog/private-acme-server/#apacheuploadsacme-apachepng-apache-example)
-  - [nginx](https://smallstep.com/blog/private-acme-server/#nginxuploadsacme-nginxpng-nginx-example)
+  - [certbot](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#certbot)
+  - [acme.sh](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#acmesh)
+  - [win-acme](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#win-acme)
+  - [Caddy](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#caddy-v2)
+  - [Traefik](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#traefik)
+  - [Apache](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#apache)
+  - [nginx](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#nginx)
 - Get certificates programmatically using ACME, using these libraries:
-  - [`lego`](https://github.com/go-acme/lego) for Golang ([example usage](https://smallstep.com/blog/private-acme-server/#golanguploadsacme-golangpng-go-example))
-  - certbot's [`acme` module](https://github.com/certbot/certbot/tree/master/acme) for Python ([example usage](https://smallstep.com/blog/private-acme-server/#pythonuploadsacme-pythonpng-python-example))
-  - [`acme-client`](https://github.com/publishlab/node-acme-client) for Node.js ([example usage](https://smallstep.com/blog/private-acme-server/#nodejsuploadsacme-node-jspng-nodejs-example))
+  - [`lego`](https://github.com/go-acme/lego) for Golang ([example usage](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#golang))
+  - certbot's [`acme` module](https://github.com/certbot/certbot/tree/master/acme) for Python ([example usage](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#python))
+  - [`acme-client`](https://github.com/publishlab/node-acme-client) for Node.js ([example usage](https://smallstep.com/docs/tutorials/acme-protocol-acme-clients#node))
 - Our own [`step` CLI tool](https://github.com/smallstep/cli) is also an ACME client!
 - See our [ACME tutorial](https://smallstep.com/docs/tutorials/acme-challenge) for more