Polish Registry Server index and intro pages

Author: danbarr

docs/toolhive/guides-registry/index.mdx

@@ -15,6 +15,24 @@ It provides a standardized REST API for discovering and accessing MCP servers
 from multiple backend sources, including Kubernetes clusters, Git repositories,
 API endpoints, and local files.
 
+:::note[Registry Server vs. built-in registry]
+
+This is the **Registry Server** — a standalone service for hosting and curating
+your own MCP server catalog. For the built-in registry that ships with ToolHive,
+see [Explore the registry](../guides-cli/registry.mdx) (CLI) or
+[Explore the registry](../guides-ui/registry.mdx) (UI).
+
+:::
+
+## Where to start
+
+- **Evaluating the Registry Server?** Read the [Introduction](./intro.mdx) for
+  architecture, features, and supported registry source types.
+- **Ready to deploy?** See [Deployment overview](./deployment.mdx) to choose
+  between Kubernetes Operator and manual deployment methods.
+- **Already running?** Jump to [Configuration](./configuration.mdx) or
+  [Authentication](./authentication.mdx).
+
 ## Contents
 
 <DocCardList />

docs/toolhive/guides-registry/intro.mdx

@@ -6,6 +6,10 @@ description:
   skills
 ---
 
+The ToolHive Registry server is a standards-compliant implementation of the MCP
+Registry API specification. It provides a REST API for discovering and accessing
+MCP servers from multiple backend sources.
+
 :::note[Registry Server vs. built-in registry]
 
 This section covers the **Registry Server** — a standalone service you deploy
@@ -18,10 +22,6 @@ MCP servers from the default catalog. That's a different feature: see
 
 :::
 
-The ToolHive Registry server is a standards-compliant implementation of the MCP
-Registry API specification. It provides a REST API for discovering and accessing
-MCP servers from multiple backend sources.
-
 ## Overview
 
 The Registry server aggregates MCP server metadata from various sources and