mention unsupported registries (coder#274)

bpmct · Katie Horne · web-flow · commit 91cc549d2c98 · 2021-04-14T10:58:27.000-04:00
* add mention of unsupported registries

* Simplify wording

Co-authored-by: Katie Horne &lt;katie@coder.com&gt;
diff --git a/admin/registries/index.md b/admin/registries/index.md
@@ -37,3 +37,10 @@ When done, click **Import**.
 To delete a registry, go to the **Images** > **Registries** page. Find the
 registry that you'd like to remove, click its **horizontal ellipses** icon, and
 select **Delete**.
+
+## Unsupported registries
+
+Coder does not support the following registries at this time:
+
+- Amazon ECR
+- GitHub Packages
