* formatting paragraphs

* remove reference to consul 1.6-beta and update nomad agent command

* remove tech preview status and update limitations

* remove beta tag in navigation

* add screenshot of count dashboard

* update example summary and remove redis references

* capitalize Consul

* minor corrections

* hcl formatting
* demo is on localhost not host ip
* clarify consul on PATH

* mention variable interpolation limitation

docs: Initial documentation for volume(_mount)

* hcl formatting
* demo is on localhost not host ip
* clarify consul on PATH

Splitting the immutable and mutable components of the scriptCheck led
to a bug where the environment interpolation wasn't being incorporated
into the check's ID, which caused the UpdateTTL to update for a check
ID that Consul didn't have (because our Consul client creates the ID
from the structs.ServiceCheck each time we update).

Task group services don't have access to a task environment at
creation, so their checks get registered before the check can be
interpolated. Use the original check ID so they can be updated.

e2e: test demo job for connect

* ar: refactor network bridge config to use go-cni lib

* ar: use eth as the iface prefix for bridged network namespaces

* vendor: update containerd/go-cni package

* ar: update network hook to use TODO contexts when calling configurator

* unnecessary conversion

NOMAD_PORT_<label> regression

Fix memory fingerprinting on 32bit

Co-Authored-By: Michael Schurter <mschurter@hashicorp.com>

Update default raft protocol to version 3

Also add a utility function for waiting for stable leadership

Fix tests whose messages seem timing dependent.

Tests typically call join cluster directly rather than rely on consul
discovery.  Worse, consul discovery seems to cause additional leadership
transitions when a server is shutdown in tests than tests expect.

docs: task driver resource isolation & security