rename mcp to ai/model-context-protocol (#966)

Author: ethanpalm

mcp.mdx renamed to ai/model-context-protocol.mdx

@@ -44,7 +44,7 @@
               "ai/llmstxt",
               "ai/contextual-menu",
               "ai/markdown-export",
-              "mcp",
+              "ai/model-context-protocol",
               "guides/geo",
               "guides/claude-code",
               "guides/cursor",