Reorganize monorepo structure

* Move all config files to './configs'
* Simplify './scripts' folder.

packages/react-native-web-examples/next.config.js

@@ -0,0 +1,12 @@
+const fs = require('fs');
+const path = require('path');
+
+const pages = fs
+  .readdirSync(path.resolve(__dirname, 'pages'), { withFileTypes: true })
+  .filter((dirent) => dirent.isDirectory())
+  .map((dirent) => dirent.name);
+
+module.exports = {
+  outDir: 'dist',
+  env: { pages }
+};