feat: add helm chart install documentation

docs/installation/install.md

@@ -38,7 +38,25 @@ and see when the `kube-green-controller-manager` pod is up and running.
 
 *kube-green* has its own Helm chart which can be used to install the operator in the cluster.
 
-<!-- TODO: -->
+### 1. Add the Helm repository
+
+This repository is the source of kube-green charts.
+
+```sh
+helm repo add kube-green https://kube-green.github.io/kube-green
+```
+
+### 2. Install kube-green
+
+To install the kube-green Helm chart, run:
+
+```sh
+helm install kube-green kube-green/kube-green --namespace kube-green --create-namespace
+```
+
+### Installation options
+
+A full list of available Helm values is on the [Helm chart repository](https://github.com/kube-green/kube-green/tree/main/charts/kube-green).
 
 ## Operator Lifecycle Manager (OLM)
 

docs/installation/uninstall.md

@@ -53,11 +53,20 @@ To uninstall kube-green from the cluster, run:
 helm uninstall RELEASE_NAME
 ```
 
-where `RELEASE_NAME` is the name of the `kube-green` release currently installed.  
+where `RELEASE_NAME` is the name of the `kube-green` release currently installed (if you used the [install guide](./install.md#helm-chart), `kube-green`).  
 This command, by default, will not delete the CRDs from the cluster, which should be deleted manually.
 
 If you have set the `crds.keep` value to *false* during the installation, also the CRDs will be deleted as well.
 
+:::danger
+This command will remove all `SleepInfo` resources from the cluster:
+
+```sh
+kubectl delete crd sleepinfos.kube-green.io
+```
+
+:::
+
 ## Operator Lifecycle Manager (OLM)
 
 To uninstall kube-green from the cluster, follow [this guide](https://olm.operatorframework.io/docs/tasks/uninstall-operator/).