Update index.mdx

Updated docs to remove `reactStrictMode: true, swcMinify: true`as they default to true as of Next.js version 13 and up.

content/docs/100-getting-started/index.mdx

@@ -52,7 +52,7 @@ To hook Contentlayer into the `next dev` and `next build` processes, you'll want
 const { withContentlayer } = require('next-contentlayer')
 
 /** @type {import('next').NextConfig} */
-const nextConfig = { reactStrictMode: true, swcMinify: true }
+const nextConfig = { }
 
 module.exports = withContentlayer(nextConfig)
 ```