docs: Promote MCP content in the left nav and revise the MCP connection component docs (#8567)

* related links and nav change

* create mcp client page and condense mcp tool info

* rewrite mcp client content

* add mcp to the welcome page

* tweak text regarding modes

* small style edits

* minor edit

docs/sidebars.js

@@ -41,7 +41,6 @@ module.exports = {
         "Concepts/concepts-objects",
         "Concepts/concepts-publish",
         "Concepts/embedded-chat-widget",
-        "Concepts/mcp-server",
         "Concepts/concepts-file-management",
         "Concepts/concepts-voice-mode",
       ],
@@ -74,6 +73,14 @@ module.exports = {
         "Agents/agent-tool-calling-agent-component",
       ],
     },
+    {
+      type: "category",
+      label: "Model Context Protocol (MCP)",
+      items: [
+        "Concepts/mcp-server",
+        "Components/mcp-client",
+      ],
+    },
     {
       type: "category",
       label: "Configuration",