docs(sb): add mcp server section (#8471)

Author: Lukas742

.storybook/preview.tsx

@@ -140,6 +140,7 @@ const preview: Preview = {
         order: [
           'Getting Started',
           'Project Templates & Examples',
+          'MCP Server',
           'Change Log',
           'Migration Guide',
           'Knowledge Base',

docs/MCPServer.mdx

@@ -0,0 +1,9 @@
+import { Footer } from '@sb/components';
+import { Markdown, Meta } from '@storybook/addon-docs/blocks';
+import MCPServerReadme from '../packages/mcp-server/README.md?raw';
+
+<Meta title="MCP Server" />
+
+<Markdown>{MCPServerReadme.replace(/^## Contributing[\s\S]*$/m, '')}</Markdown>
+
+<Footer />