fix: add static export config for GitHub Pages deploy

Author: fyalavuz

apps/docs/next.config.mjs

@@ -1,5 +1,7 @@
 /** @type {import('next').NextConfig} */
 const config = {
+  output: 'export',
+  basePath: process.env.NEXT_PUBLIC_BASE_PATH || '',
   transpilePackages: ['appshell-react'],
   images: { unoptimized: true },
 };