Update registry references to toolhive-registry repo

- Update registry definition reference to point to toolhive-registry repo
- Update issue submission link to use toolhive-registry repo
- Update pull request submission reference to toolhive-registry repo

Fixes #131

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: danbarr

docs/toolhive/concepts/registry-criteria.md

@@ -11,17 +11,18 @@ high-quality MCP servers through clear, observable, and objective criteria.
 
 If you have an MCP server that you'd like to add to the ToolHive registry, you
 can
-[open an issue](https://github.com/stacklok/toolhive/issues/new?template=add-an-mcp-server.md)
-or submit a pull request to the ToolHive GitHub repository. The ToolHive team
-will review your submission and consider adding it to the registry.
+[open an issue](https://github.com/stacklok/toolhive-registry/issues/new?template=add-an-mcp-server.md)
+or submit a pull request to the
+[ToolHive-registry](https://github.com/stacklok/toolhive-registry) repository.
+The ToolHive team will review your submission and consider adding it to the
+registry.
 
 Criteria for adding an MCP server to the ToolHive registry are outlined below.
 These criteria ensure that the servers in the registry meet the standards of
 security, quality, and usability that ToolHive aims to uphold.
 
 Registry entries are defined in the
-[`pkg/registry/data/registry.json`](https://github.com/stacklok/toolhive/blob/main/pkg/registry/data/registry.json)
-file in the ToolHive repository.
+[ToolHive-registry](https://github.com/stacklok/toolhive-registry) repository.
 
 ## Criteria for MCP servers