Add metadata to each page in docs.chef.io/inspec, update Edit on GitHub links

[IanMadd]

Description

This does two things:

• update how Edit on GitHub links are generated
• add product metadata to each page in docs.chef.io/inspec/

We've got a partial in chef-web-docs that handles Edit on GitHub links now, we just need specify which repo each page comes from.

We can use the cascade parameter key in content/inspec/_index.md to add a product value to every page docs.chef.io/habitat/ so we can facet search results by that product

Issues

chef/chef-web-docs#2878
chef/chef-web-docs#2775

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.

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[chef-expeditor]

Hello IanMadd! Thanks for the pull request!

Here is what will happen next:

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   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.

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