docs: Update TOC in getting started doc
- [Prerequisites](#prerequisites)
- [Bootstrapping AWS Identity and Access Management with CloudFormation](#bootstrapping-aws-identity-and-access-management-with-cloudformation)
- [Installing clusterawsadm](#installing-clusterawsadm)
- - [SSH key pair](#ssh-key-pair)
- - [Create a fresh key pair](#create-a-fresh-key-pair)
+ - [SSH Key pair](#ssh-key-pair)
+ - [Create a new key pair](#create-a-new-key-pair)
- [Using an existing key](#using-an-existing-key)
- [Setting up Minikube](#setting-up-minikube)
- - [Customising for Cluster API](#customising-for-cluster-api)
+ - [Customizing for Cluster API](#customizing-for-cluster-api)
- [Setting up the environment](#setting-up-the-environment)
- [Deploying a cluster](#deploying-a-cluster)
- [Generating cluster manifests](#generating-cluster-manifests)
