Document k8s pv removal (#1067)

* aws ebs csi: document (retained) pv(c) removal

Currently aws ebs csi storage class is configured to retain persistent
volumes (pv) (safery measure). This documents how to remove PV(C)s and
corresponding AWS EBS Volume (to avoid accumulating hangling resources
and costs)

* Remove unnecessary document

Author: YuryHrytsuk

charts/aws-ebs-csi-driver/README.md

@@ -0,0 +1,28 @@
+## How to delete volumes with `recalimPolicy: retain`
+1. Delete pvc:
+```
+kubectl delete pvc <pvc-name>
+```
+
+2. Verify PV is `released`
+```
+kubectl get pv <pv-name>
+```
+
+3. Manually remove EBS in AWS
+    1. Go to AWS GUI and List EBS Volumes
+    1. Filter by tag `ebs.csi.aws.com/cluster=true`
+    1. Identify the volume associated with your PV (check `kubernetes.io/created-for/pv/name` tag of the EBS Volume)
+    1. Verify that EBS Volume is `Available`
+    1. Delete EBS Volume
+
+4. Delete the PV
+```
+kubectl delete pv <pv-name>
+```
+
+5. Remove Finalizers (if necessary)
+If the PV remains in a Terminating state, remove its finalizers:
+```
+kubectl patch pv <pv-name> -p '{"metadata":{"finalizers":null}}'
+```