init: add project files

next.config.mjs

@@ -0,0 +1,18 @@
+import rehypePrism from '@mapbox/rehype-prism'
+import nextMDX from '@next/mdx'
+import remarkGfm from 'remark-gfm'
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  pageExtensions: ['js', 'jsx', 'ts', 'tsx', 'mdx'],
+}
+
+const withMDX = nextMDX({
+  extension: /\.mdx?$/,
+  options: {
+    remarkPlugins: [remarkGfm],
+    rehypePlugins: [rehypePrism],
+  },
+})
+
+export default withMDX(nextConfig)