Give demo agents unique names to improve `nomad node status` output.
Since the agents default to the hostname, they all had the same name
whether using the root or demo Vagrantfiles.
* hclfmt the world
* 2 space indent
* make every example well formed with stanzas and comments
* jsonfmt too
* mdfmt manually
* _ instead of *
* no [links][], only [links][links]
* ordered lists instead of bullets when possible
* lots of wording fixes
* de-contractionization
* add 127.0.0.1 to SANs
* -1 on intentional errors
* -1 on first person
Michael Schurter