Use static export.

package.json

 {
   "name": "developers",
   "version": "0.1.0",
-  "private": true,
   "scripts": {
     "dev": "next dev",
-    "build": "next build",
-    "start": "next start"
+    "build": "next build && next export"
   },
   "dependencies": {
     "base64-js": "^1.3.1",