github newrelic/docs-website release-10.25.2021-08.23

🚀 What's new?

@x8a - Revert "Revert "feature(k8s metrics adaptor): add new integration"" ->
@zuluecho9 - fix(site): broken links ->
@zuluecho9 - fix(root nav): adding guides entry back ->
@zuluecho9 - Merge pull request #4504 from newrelic/Some-nav-changes ->
@zuluecho9 - Merge pull request #4502 from newrelic/Fixing-some-404s ->
@x8a - Merge pull request #4500 from newrelic/revert-4497-revert-4474-Adding-k8s-metrics-adaptor-integration ->

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