[docs]: add updated mcp documentation (#906)

# why

Updating the documentation to match the new MCP server that was recently
released.

# what changed

Added the docs from browserbase and removed the other integration points
with outdated information about the MCP server.

# test plan

Author: Kylejeong2

docs/docs.json

@@ -50,12 +50,16 @@
       {
         "group": "Integrations",
         "pages": [
+          {
+            "group": "MCP Server",
+            "pages": [
+              "integrations/mcp/introduction",
+              "integrations/mcp/setup",
+              "integrations/mcp/tools",
+              "integrations/mcp/configuration"
+            ]
+          },
           "integrations/langchain",
-          "integrations/windsurf",
-          "integrations/mcp-server",
-          "integrations/cursor",
-          "integrations/cline",
-          "integrations/claude-code",
           "integrations/crew-ai"
         ]
       }