Move ipv6 support note to FAQs and re-format FAQs

site/content/en/docs/faq/_index.md

@@ -6,11 +6,11 @@ description: >
   Questions that come up regularly
 ---
 
-## Operating-systems
+## Does minikube support IPv6?
 
-## Linux
+minikube currently doesn't support IPv6. However, it is on the [roadmap]({{< ref "/docs/contrib/roadmap.en.md" >}}).
 
-### Preventing password prompts
+## How can I prevent password prompts on Linux?
 
 The easiest approach is to use the `docker` driver, as the backend service always runs as `root`.
 

site/content/en/docs/handbook/config.md

@@ -85,10 +85,6 @@ For instance, to allow Kubernetes to launch on an unsupported Docker release:
 minikube start --extra-config=kubeadm.ignore-preflight-errors=SystemVerification
 ```
 
-### IPv6 support
-
-minikube currently doesn't support IPv6. However, it is on the [roadmap]({{< ref "/docs/contrib/roadmap.en.md" >}}).
-
 ## Runtime configuration
 
 The default container runtime in minikube is Docker. You can select it explicitly by using: