Update node.js to v14

Author: AleksTeresh

next-env.d.ts

@@ -2,4 +2,4 @@
 /// <reference types="next/image-types/global" />
 
 // NOTE: This file should not be edited
-// see https://nextjs.org/docs/basic-features/typescript for more information.
+// see https://nextjs.org/docs/pages/building-your-application/configuring/typescript for more information.

next.config.js

@@ -1,4 +1,5 @@
 module.exports = {
+  output: 'export',
   webpack: (config) => {
     config.module.rules.push({
       test: /\.md$/,