feat(nri-docker): add docker integration docs page

[rajrohanyadav]

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Please follow conventional commit standards in your commit messages and pull request title.

Give us some context

• What problems does this PR solve? Adds detailed info about the nri-docker integration
• Add any context that will help us review your changes such as testing notes, links to related docs, screenshots, etc. https://github.com/newrelic/nri-docker
• If your issue relates to an existing GitHub issue, please link to it. N/A

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[nr-ksteinbach]

thanks. LGTM from Product side.