feat: complete migration to static MDX, stabilize local infrastructure and fix i18n issues

next.config.mjs

@@ -1,7 +1,9 @@
 import withMintelConfig from "@mintel/next-config";
+import createMDX from "@next/mdx";
 
 /** @type {import('next').NextConfig} */
 const nextConfig = {
+    pageExtensions: ["js", "jsx", "md", "mdx", "ts", "tsx"],
     async rewrites() {
         const umamiUrl =
             process.env.UMAMI_API_ENDPOINT ||
@@ -33,4 +35,6 @@ const nextConfig = {
     },
 };
 
-export default withMintelConfig(nextConfig);
+const withMDX = createMDX({});
+
+export default withMintelConfig(withMDX(nextConfig));