github newrelic/docs-website release-11.30.2021-05.19

🚀 What's new?

@urbiz-nr - Revert "Revert "feat(Infra): Cleaning up Infra UI docs IA, adding new doc for Pegasus"" ->
@urbiz-nr - chore(Infra): Updated doc, added screenshots, signup CTA ->
@urbiz-nr - Merge pull request #4997 from newrelic/revert-4994-revert-4992-Pegasus-Nov-30-updates ->

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