Docs: Breaking changes guide in a directory (#72786)

Co-authored-by: Marcus Andersson <marcus.andersson@grafana.com>

.github/workflows/detect-breaking-changes-report.yml

@@ -110,7 +110,7 @@ jobs:
           ${{ steps.levitate-run.outputs.message }}
 
           [Console output](${{ steps.levitate-run.outputs.job_link }})
-          [Read our guideline](https://github.com/grafana/grafana/blob/main/contribute/breaking-changes-guide.md)
+          [Read our guideline](https://github.com/grafana/grafana/blob/main/contribute/breaking-changes-guide/breaking-changes-guide.md)
 
     # Remove comment from the PR (no more breaking changes)
     - name: Remove comment from PR

contribute/README.md

@@ -8,6 +8,7 @@ This directory contains guides for contributors to the Grafana project.
 - [Triage issues](triage-issues.md)
 - [Merge a pull request](merge-pull-request.md)
 - [Making changes to the CI pipeline](drone-pipeline.md)
+- [Breaking changes in frontend APIs](./breaking-changes-guide/breaking-changes-guide.md)
 
 The `style-guides` directory contains style guides for the Grafana software project and documentation.