dhi: update quickstart (#23851)

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## Description

Issue: The navigation changes based on entitlement.

Fix:
- Updated step to list both possible navs.
- Removed screenshots. They were included originally to show where the
nav was because the nav magically appeared when gaining entitlement.

## Related issues or tickets

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## Reviews

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- [ ] Editorial review

Signed-off-by: Craig Osterhout <[email protected]>

Author: craig-osterhout

content/manuals/dhi/get-started.md

@@ -22,15 +22,10 @@ specific image as an example, they can be applied to any 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**.
-
-   ![Docker Hub sidebar showing DHI catalog](./images/dhi-catalog.png)
-
+2. In the left sidebar, select **Hardened Images**. If you have DHI Enterprise,
+   then select **Hardened Images** > **Catalog**.
 3. Use the search bar or filters to find an image (e.g., `python`, `node`,
    `golang`). For this guide, use the Python image as an example.
-
-    ![DHI catalog with Python repository shown](./images/dhi-python-search.png)
-
 4. Select the Python repository to view its details.
 
 Continue to the next step to pull and run the image. To dive deeper into exploring