message: docs(core): add circleci insights metrics widget
  PR Close
diff: </a>
  </p>
  +<p align="center">
  + <a href="https://app.circleci.com/insights/github/angular/angular/workflows/default_workflow?branch=main">
  + <img src="https://dl.circleci.com/insights-snapshot/gh/angular/angular/main/default_workflow/badge.svg" alt="InsightsSnapshot" />
  + </a>
  +</p>
  +
  <hr>
  ## Documentation
  