add JSON download link

[yktakaha4]

This PR fixes #

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR?

Thank you to the maintainers of this great OSS.

/api/:namespace added in the PR below is very useful, but is not exposed to users. I felt that introducing it through a dashboard and documentation would make it easier to utilize. ref: https://github.com/FairwindsOps/goldilocks/pull/586

What changes did you make?

• Added a link to /api/:namespace in the dashboard.
• Added API description to the documentation.

What alternative solution should we consider, if any?

goldilocks summary is useful, but requires users to download the CLI themselves.

If /api/ is an internal feature, this may not be a good change.

[CLAassistant]

All committers have signed the CLA.