website: document Quota field in ns payloads

fix 'nomad namespace apply' help message

The auto-generation of TOC wasn’t working because the
“auto-linking header tags” described here doesn’t work
if the file isn’t Markdown:
https://github.com/hashicorp/middleman-hashicorp#auto-linking-header-tags

Named arguments need to preceed positional arguments.

website: Link to 0.10.0-beta1 release

Start of docs for group level service and network stanza.

docs: mention task field for checks

Docs: Added alloc_exec and alloc_node_exec capabilities

These were added in https://github.com/hashicorp/nomad/commit/4f7bd68f5ca9f330a894bfb4375b87f786e1e7a3

Tweak wording in changelog to match other entries.

docs: add more detail to connect stanzas

When multiple developers are working on e2e testing, it helps to be
able to identify which infrastructure belongs to which Nomad SHA and
which developer. This adds tags to the EC2 instances.

e2e: script check testing

docs: Add host volume acl docs

acl_docs: Stylistic improvements
Co-Authored-By: Tim Gross <tim@0x74696d.com>

Fix host volume path

Fix inplace updates bug with group level networks

During inplace updates, we should be using network information
from the previous allocation being updated.

This semi-reverts #6275, as the tests are intermittently
failing in CI.

Initial placeholder connect docs

connect: check if consul is on PATH