docs: Add MCP Server to API Instances landing page

Include MCP Server in the main API Instances and Providers page
so it's visible alongside Hermes and Pythnet RPC options.

Author: itsOmSarraf

pages/price-feeds/api-instances-and-providers.mdx

@@ -1,9 +1,10 @@
 # API Instances and Providers
 
-The following documentation explains how to get access to an instance of Hermes or a Pythnet RPC.
-Developers may need access to these services in order to use Pyth Price Feeds.
-Both services can be self-hosted or accessed through a third-party provider.
+The following documentation explains how to access Pyth Network price feeds through various methods.
+Developers may need access to these services in order to use Pyth Price Feeds in their applications.
+These services can be self-hosted, accessed through a third-party provider, or integrated directly with AI systems.
 See the following guides to learn more about how to access each service:
 
-- [Hermes](api-instances-and-providers/hermes)
-- [Pythnet RPC](api-instances-and-providers/pythnet-rpc)
+- [Hermes](api-instances-and-providers/hermes) - REST API for fetching price updates
+- [MCP Server (AI Agents)](api-instances-and-providers/mcp-server) - Model Context Protocol server for AI agents and autonomous systems
+- [Pythnet RPC](api-instances-and-providers/pythnet-rpc) - Direct RPC access to Pythnet