message: Cross-ref cost insights README to blog
diff: @@ -11,6 +11,8 @@ At Spotify, we find that cloud costs are optimized organically when:
  Cost Insights shows trends over time, at the granularity of Backstage catalog entities - rather than the cloud provider's concepts. It can be used to troubleshoot cost anomalies, and promote cost-saving infrastructure migrations.
  +Learn more with the Backstage blog post [New Cost Insights plugin: The engineer's solution to taming cloud costs](https://backstage.io/blog/2020/10/22/cost-insights-plugin).
  +
  ## Install
  ```bash
  