dhi: update helm topic (#25334)

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## Description

Updated intro and the section for find.

The Helm docs link is removed as users on this page are expected to know
what a Helm chart is, and "Docker-provided" immediately before it makes
the link misleading. The Find section is no longer needed as the catalog
can be linked directly and viewed without signing in.

Preview:
https://deploy-preview-25334--docsdocker.netlify.app/dhi/how-to/helm/

## Related issues or tickets

https://docker.slack.com/archives/C04300R4G5U/p1781196686143879

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Editorial review

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>

Author: craig-osterhout

content/manuals/dhi/how-to/helm.md

@@ -6,11 +6,8 @@ keywords: use hardened image, helm, k8s, kubernetes, dhi chart, chart
 weight: 31
 ---
 
-Docker Hardened Image (DHI) charts are Docker-provided [Helm
-charts](https://helm.sh/docs/) built from upstream sources, designed for
-compatibility with Docker Hardened Images. These charts are available as OCI
-artifacts within the DHI catalog on Docker Hub. For more details, see [Docker
-Hardened Image charts](/dhi/features/helm/).
+Docker Hardened Image (DHI) charts are Docker-provided Helm charts built from upstream sources, designed for
+compatibility with Docker Hardened Images. These charts are available in the [DHI catalog on Docker Hub](https://hub.docker.com/hardened-images/catalog?types=helmChart).
 
 DHI charts incorporate multiple layers of supply chain security that aren't present in upstream charts:
 
@@ -26,15 +23,6 @@ charts to reference customized images and mirrored repositories. The customized
 chart build pipeline ensures that your customizations are built securely, use
 the latest base charts, and include attestations.
 
-## Find a Docker Helm chart
-
-To find a Docker Helm chart for DHI:
-
-1. Go to the Hardened Images catalog in [Docker Hub](https://hub.docker.com/hardened-images/catalog) and sign in.
-2. In the left sidebar, select **Hardened Images** > **Catalog**.
-3. Select **Filter by** for **Helm Charts**.
-4. Select a Helm chart repository to view its details.
-
 ## Mirror a Helm chart and/or its images to a third-party registry
 
 If you want to mirror to your own third-party registry, you can follow the