Update intro/overview pages (#438)

* Add doc search and Optimizer to main index
* Update card hover image
* Add Cursor Hooks to main index
* Update overview pages

---------

Signed-off-by: Dan Barr <6922515+danbarr@users.noreply.github.com>
Co-authored-by: Dan Barr <6922515+danbarr@users.noreply.github.com>

Author: danbarr

.github/copilot-instructions.md

@@ -0,0 +1 @@
+../AGENTS.md

.github/copilot-instructions.md

@@ -10,7 +10,7 @@ import DocCardList from '@theme/DocCardList';
 ## Introduction
 
 The ToolHive CLI (`thv`) is a command-line tool that allows you to deploy and
-manage MCP servers on your local machines or in development environments. It
+manage MCP servers on your local machine or in development environments. It
 provides quick deployment of MCP servers and supports advanced features like
 custom permissions, network access filtering, and telemetry.
 

docs/toolhive/guides-cli/index.mdx

@@ -9,8 +9,8 @@ import DocCardList from '@theme/DocCardList';
 
 ## Introduction
 
-The ToolHive Registry server implements the official
-[Model Context Protocol (MCP) Registry API specification](https://github.com/modelcontextprotocol/registry/blob/main/docs/reference/api/generic-registry-api.md)
+The ToolHive Registry Server is an implementation of the official
+[Model Context Protocol (MCP) Registry API specification](https://github.com/modelcontextprotocol/registry/blob/main/docs/reference/api/generic-registry-api.md).
 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.