Update beats-ci references in README (elastic#40935)

Author: rowlandgeoff

README.md

@@ -1,4 +1,3 @@
-[![Build Status](https://beats-ci.elastic.co/job/Beats/job/beats/job/main/badge/icon)](https://beats-ci.elastic.co/job/Beats/job/beats/job/main/)
 [![Go Report Card](https://goreportcard.com/badge/github.com/elastic/beats)](https://goreportcard.com/report/github.com/elastic/beats)
 [![Reviewed by Hound](https://img.shields.io/badge/Reviewed_by-Hound-8E64B0.svg)](https://houndci.com)
 
@@ -88,26 +87,9 @@ For testing purposes, we generate snapshot builds that you can find [here](https
 It is possible to trigger some jobs by putting a comment on a GitHub PR.
 (This service is only available for users affiliated with Elastic and not for open-source contributors.)
 
-* [beats][]
-  * `buildkite test it` or `/test` will kick off a default build.
-  * `/test macos` will kick off a default build with also the `macos` stages.
-  * `/test <beat-name>` will kick off the default build for the given PR in addition to the `<beat-name>` build itself.
-  * `/test <beat-name> for macos` will kick off a default build with also the `macos` stage for the `<beat-name>`.
-* [apm-beats-update][]
-  * `/run apm-beats-update`
-* [apm-beats-packaging][]
-  * `/package` or `/packaging` will kick of a build to generate the packages for beats.
-* [apm-beats-tester][]
-  * `/beats-tester` will kick of a build to validate the generated packages.
+* [beats CI pipeline](https://buildkite.com/elastic/beats)
+  * `/test` will kick off a default build.
 
 ### PR Labels
 
-It's possible to configure the build on a GitHub PR by labelling the PR with the below labels
-
-* `<beat-name>` to force the following builds to run the stages for the `<beat-name>`
-* `macOS` to force the following builds to run the `macos` stages.
-
-[beats]: https://beats-ci.elastic.co/job/Beats/job/beats/
-[apm-beats-update]: https://beats-ci.elastic.co/job/Beats/job/apm-beats-update/
-[apm-beats-packaging]: https://beats-ci.elastic.co/job/Beats/job/packaging/
-[apm-beats-tester]: https://beats-ci.elastic.co/job/Beats/job/beats-tester/
+It's possible to configure the build on a GitHub PR by labeling the PR with certain labels. Elastic users can find more details at https://docs.elastic.dev/ingest-dev-docs/beats/beats-ci.