Adding recommendation to Registry Overview (#2042)

[ ] Check if this is a typo or other quick fix and ignore the rest :)

## Type of change
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We don't offer an SLA for cgr.dev, this pr adds this info to the
registry overview and includes a recommendation that customers use a
pull through proxy for maximum reliability.

### What should this PR do?
<!-- Does this PR resolve an issue? Please include a reference to it.
-->
Resolves chainguard-dev/internal#4572

### Why are we making this change?
<!-- What larger problem does this PR address? -->

### What are the acceptance criteria? 
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criteria. -->
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add them. -->

### How should this PR be tested?
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This is a fairly small update but should be reviewed for clarity.

Relevant preview link:
https://deploy-preview-2042--ornate-narwhal-088216.netlify.app/chainguard/chainguard-registry/overview/

Signed-off-by: Mark Drake <[email protected]>

content/chainguard/chainguard-registry/overview.md

@@ -27,3 +27,14 @@ You can check the status of the Chainguard Registry at [https://status.cgr.dev](
 ## Network Requirements
 
 Refer to our [Chainguard Images Network Requirements](/chainguard/administration/network-requirements) reference page for details about how to ensure access to Chainguard Registry in environments using firewalls, access control lists, and proxies.
+
+## Using a Caching Proxy with the Chainguard Registry
+
+Chainguard does not offer an SLA for uptime for the Chaingaurd Registry. In order to minimize production dependency on the Chainguard Registry, we recommend that customers use a pull-through proxy for maximum reliability.
+
+We currently provide documentation on how you can set up a pull-through cache for the Chainguard Registry on the following platforms:
+
+* [Google Artifact Registry](/chainguard/chainguard-registry/pull-through-guides/artifact-registry-pull-through/)
+* [JFrog Artifactory](/chainguard/chainguard-registry/pull-through-guides/artifactory/)
+* [Sonatype Nexus](/chainguard/chainguard-registry/pull-through-guides/nexus-pull-through/)
+* [Cloudsmith](/chainguard/chainguard-registry/pull-through-guides/cloudsmith-pull-through/)