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>

charts/argo-workflows/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: v3.4.11
 name: argo-workflows
 description: A Helm chart for Argo Workflows
 type: application
-version: 0.33.2
+version: 0.33.3
 icon: https://argoproj.github.io/argo-workflows/assets/logo.png
 home: https://github.com/argoproj/argo-helm
 sources:
@@ -16,5 +16,5 @@ annotations:
     fingerprint: 2B8F22F57260EFA67BE1C5824B11F800CD9D2252
     url: https://argoproj.github.io/argo-helm/pgp_keys.asc
   artifacthub.io/changes: |
-    - kind: changed
-      description: Upgrade Argo Workflows to v3.4.11
+    - kind: fixed
+      description: Add HA docs and example