Add support for MDX (#17)

* feat: add support for MDX

* fix: prevent empty server handler error message

* doc: add MDX mention to README

* feat: update version to v0.7.0

packages/fs-router-vite-plugin/tests/generator/mdx/routeTree.expected.ts

@@ -0,0 +1,29 @@
+// This file is auto-generated by Tuono
+
+import { createRoute, dynamic } from 'tuono'
+
+import RootImport from './routes/__root'
+
+const AboutImport = dynamic(() => import('./routes/about.mdx'))
+const IndexImport = dynamic(() => import('./routes/index'))
+
+const rootRoute = createRoute({ isRoot: true, component: RootImport })
+
+const About = createRoute({ component: AboutImport })
+const Index = createRoute({ component: IndexImport })
+
+// Create/Update Routes
+
+const AboutRoute = About.update({
+  path: '/about',
+  getParentRoute: () => rootRoute,
+})
+
+const IndexRoute = Index.update({
+  path: '/',
+  getParentRoute: () => rootRoute,
+})
+
+// Create and export the route tree
+
+export const routeTree = rootRoute.addChildren([IndexRoute, AboutRoute])