Docs updates to install inspec 6

[IanMadd]

Add and update docs to install and license InSpec 6.

Description

Adds/updates the following pages:

• install instructions at docs.chef.io/inspec/install/
• license content at docs.chef.io/inspec/license/, which includes:
  • accept license
  • set license key
  • use local license service
• supported platforms content at docs.chef.io/inspec/platforms
• uninstall instructions at docs.chef.io/inspec/uninstall

Adds a new Install menu section that includes the above ☝️ pages.
Note since the menu config was just added to this repo this menu config will be overridden by the InSpec menu config in chef-web-docs until it's removed there.

The existing Cloud Platforms page is moved to docs.chef.io/inspec/cloud_platforms.

Related PRs

chef/chef-web-docs#4140
chef/license-service#346

Related Issue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New content (non-breaking change)
• Breaking change (a content change which would break existing functionality or processes)

Checklist:

• I have read the CONTRIBUTING document.

[chef-expeditor]

Hello IanMadd! Thanks for the pull request!

Here is what will happen next:

1. Your PR will be reviewed by the maintainers.
2. Possible Outcomes
   a. If everything looks good, one of them will approve it, and your PR will be merged.
   b. The maintainer may request follow-on work (e.g. code fix, linting, etc). We would encourage you to address this work in 2-3 business days to keep the conversation going and to get your contribution in sooner.
   c. Cases exist where a PR is neither aligned to Chef InSpec's product roadmap, or something the team can own or maintain long-term. In these cases, the maintainer will provide justification and close out the PR.

Thank you for contributing!

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[clintoncwolfe]

@IanMadd This section is new. Missing links. If you think it need restructuring I'm open to that.

[IanMadd]

@clintoncwolfe What is the text of error code 173 when you don't enter a license key? We should add that to the troubleshooting page. See #6609.

[clintoncwolfe]

This is a public-safe dummy value. I wanted to use realistic values. If you feel it is better, documentation-wise, to use a placeholder, I'm amenable.