MDX: Temporary workaround for vite:json plugin conflicts

.changeset/solid-papayas-flow.md

@@ -0,0 +1,5 @@
+---
+'fumadocs-mdx': patch
+---
+
+Temporary workaround for `vite:json` plugin conflicts

examples/react-router/content/docs/meta.json

@@ -0,0 +1,3 @@
+{
+  "pages": ["index", "..."]
+}

packages/mdx/src/vite/index.ts

@@ -52,7 +52,7 @@ export default async function mdx(
   const metaLoader = toVite(
     createMetaLoader(configLoader, {
       // vite has built-in plugin for JSON files
-      json: 'js',
+      json: 'json',
     }),
   );