installation: add link to triggermesh/charts repository (#386)

* installation: add link to triggermesh/charts repository

* Update docs/installation/kubernetes-helm.md

Co-authored-by: sebgoa <[email protected]>

---------

Co-authored-by: sebgoa <[email protected]>

Author: 2 people

docs/installation/kubernetes-helm.md

@@ -106,6 +106,9 @@ Add the TriggerMesh chart repository to Helm:
 helm repo add triggermesh https://storage.googleapis.com/triggermesh-charts
 ```
 
+!!! info "Charts source"
+    The opensource TriggerMesh Helm charts are hosted on GitHub at the [triggermesh/charts](https://github.com/triggermesh/charts/) repository.
+
 To install the chart with the release name `triggermesh`:
 
 ```sh