* navigation and initial steps of guide
* generate certs with appropriate token
* configure Nomad to use TLS
* add cli keys and certs
* add server gossip encryption section
* fix mislabeled steps
* vault paths formatting
* remove bit about cert revocation
* add clarification in challenge that we will be securing an existing Nomad cluster
* add some comments to consul-template.hcl to help user walk through it
* clarifying comments for CLI certs templates
* reorganize steps, change permissions on certs, and sub pkill command with systemctl reload nomad
* correct step reference
* add rpc upgrade mode instructions
* correct typo
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