Update README install docs, Helm over Operator
Refactor the README's installation docs to clarify that the Operator is
always used, even for Helm deployments. Also generally refactor install
docs summary for clarity and to mention recently-added subctl features.
@@ -56,8 +56,9 @@ See the [Prerequisites docs on Submariner's website](https://submariner.io/getti
## Installation
-Submariner supports deployment via an Operator as well as Helm Charts. The Operator can be deployed directly or via the `subctl` CLI helper
-utility. `subctl` greatly simplifies the deployment of Submariner, and is therefore the recommended deployment method.
+Submariner is deployed and manged by its Operator. The Operator can be deployed directly, or by using Submariner's Helm Charts, or by using
+Submariner's `subctl` CLI helper utility. `subctl` is the recommended deployment method because in addition to easy deployment it also
+provides testing, debugging, and bug-reporting capabilities.
### Installation using Operator via subctl
