Revise examples in README for better organization

Author: tashian

README.md

@@ -285,7 +285,9 @@ $ step kms sign --alg SHA256 --pss  --in data.txt 'pkcs11:token=smallstep;object
 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
 ```
 
-### Example: Signing a Root CA with step
+### Examples
+
+#### Example: Signing a Root CA with step
 
 The `step-kms-plugin` is automatically used by `step certificate create` and
 `step certificate sign` commands if we use the `--kms` flag. With these
@@ -364,7 +366,7 @@ mX6QduO/H/k8GZzcx923U54bRPCxKUaPvg==
 -----END CERTIFICATE-----
 ```
 
-### Example: Client Certificate on a YubiKey
+#### Example: Client Certificate on a YubiKey
 
 In this example, we want to issue a client certificate using a private key stored on a YubiKey.
 We're using an OIDC CA provisioner in this example. There's no device attestation in this example,
@@ -384,7 +386,7 @@ $ step ca sign mariano.csr mariano.crt
 ✔ Provisioner: Google (OIDC) [client: 1087160488420-8qt7bavg3qesdhs6it824mhnfgcfe8il.apps.googleusercontent.com]
 Your default web browser has been opened to visit:
 
-https://accounts.google.com/o/oauth2/v2/auth?client_id=1087160488420-8qt7bavg3qesdhs6it824mhnfgcfe8il.apps.googleusercontent.com&code_challenge=HRTC_KAhD35Z2Mat4p53WgT3o6zjBMi5F8DV8JhOxJE&code_challenge_method=S256&nonce=39ce704e19cfa61367143a9b691bc1adee283e7fa59a4b59d96baa5e3e288225&redirect_uri=http%3A%2F%2Flocalhost%3A55409&response_type=code&scope=openid+email&state=kQftm9UINu0kTplfFjAj1PSXIhVVg2Pa
+https://accounts.google.com/o/oauth2/v2/auth?...
 
 ✔ CA: https://ca.smallstep.com:8443
 ✔ Certificate: mariano.crt