Docs: add content to Domain Model - Host Catalogs page (#622)

website/content/docs/concepts/domain-model/host-catalogs.mdx

@@ -8,15 +8,27 @@ description: |-
 
 # Host Catalogs
 
-A host catalog is a permission boundary modeled as a container.
-A Host Catalog can contain Scopes forming a tree.
-A Scope can own zero to many
-Groups,
-Roles,
-Targets,
-and Host Catalogs.
-Scope is abstract.
-Organization and Project are concrete Scopes.
-All resources owned by a Scope are deleted when the Scope is deleted.
+A host catalog is a resource
+that contains [hosts][] and [host sets][].
+A host catalog can only be defined within a [project][].
 
 ## Attributes
+
+A host catalog has the following configurable attributes:
+
+- `name` - (optional)
+  If set, the `name` must be unique within the host catalog's [project][].
+
+- `description` - (optional)
+
+## Referenced By
+
+- [Host][]
+- [Host Set][]
+- [Project][]
+
+[host set]: /docs/concepts/domain-model/host-sets
+[host sets]: /docs/concepts/domain-model/host-sets
+[host]: /docs/concepts/domain-model/hosts
+[hosts]: /docs/concepts/domain-model/hosts
+[project]: /docs/concepts/domain-model/scopes#projects