docs(argo-workflows): add an HA section (#2183)

* feat(argo-workflows): add a sample HA config

- a `values-ha.yaml` as an example for how one would set-up HA according to the Argo Workflows docs

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

* docs(argo-workflows): add an HA section

- plus add a test for HA, which the docs link to as an example
- link back to [upstream docs](https://argoproj.github.io/argo-workflows/high-availability/) as well

- follow the same basic structure as the [Argo CD chart for HA](3e35b0c7f7/charts/argo-cd/README.md (L17))
  - as asked in review

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

---------

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>
Signed-off-by: Anton Gilgur <4970083+agilgur5@users.noreply.github.com>
Co-authored-by: Aikawa <yu.croco@gmail.com>
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@ -75,6 +75,11 @@ For full list of changes, please check ArtifactHub [changelog].
## Usage Notes
### High Availability
This chart installs the non-HA version of Argo Workflows by default. If you want to run in HA mode, you can use [these example values](ci/ha-values.yaml) as a starting point.
Please see the upstream [Operator Manual's High Availability page](https://argoproj.github.io/argo-workflows/high-availability/) to understand how to scale Argo Workflows in depth.
### Workflow controller
This chart defaults to setting the `controller.instanceID.enabled` to `false` now, which means the deployed controller will act upon any workflow deployed to the cluster. If you would like to limit the behavior and deploy multiple workflow controllers, please use the `controller.instanceID.enabled` attribute along with one of its configuration options to set the `instanceID` of the workflow controller to be properly scoped for your needs.